Cast of ER
ER is an American medical drama television series created by Michael Crichton that aired on NBC from September 19, 1994, to April 2, 2009. It was produced by Constant c Productions and Amblin Television, in association with Warner Bros. Television. The series follows the inner life of the emergency room of fictional Cook County General Hospital in Chicago, and various critical issues faced by the room's physicians and staff.
ER featured a large ensemble cast that changed dramatically over its long run. The main cast was augmented by a wealth of recurring characters and award-winning guest stars.
Main cast
The original starring cast consisted of Anthony Edwards as Dr. Mark Greene, George Clooney as Dr. Douglas "Doug" Ross, Sherry Stringfield as Dr. Susan Lewis, Noah Wyle as medical student John Carter, and Eriq La Salle as Dr. Peter Benton. Julianna Margulies guest starred in the pilot as Nurse Carol Hathaway before becoming part of the regular cast.The first additions to the main cast came in Season 2 with Gloria Reuben signing on as Physician Assistant Jeanie Boulet, and in Season 3 with Laura Innes as Dr. Kerry Weaver. In Season 4, Maria Bello signed on as Dr. Anna Del Amico and Alex Kingston joined the cast as Dr. Elizabeth Corday. Season 5 saw the addition of Kellie Martin as medical student Lucy Knight.
George Clooney's departure towards the end of Season 5 started a major cycle of main cast changes over the next few years. Season 6 opened with the addition of Paul McCrane as Dr. Robert "Rocket" Romano, Croatian actor Goran Višnjić as Dr. Luka Kovač, and Michael Michele as Dr. Cleo Finch. A bit later in the season Erik Palladino joined as Dr. Dave Malucci, and Ming-Na returned to the series as Dr. Jing-Mei "Deb" Chen, reprising a recurring character she portrayed in Season 1. Soon after, Maura Tierney was added as Nurse Abigail "Abby" Lockhart. Season 8 saw the arrival of Sharif Atkins as medical student Michael Gallant, as well as the return of Dr. Susan Lewis when Sherry Stringfield reprised her role after having left the series in Season 3.
Mekhi Phifer joined the cast in Season 9 as Dr. Gregory "Greg" Pratt. Season 10 saw the addition of Parminder Nagra as medical student Neela Rasgotra and Linda Cardellini as Nurse Samantha "Sam" Taggart. Shane West joined the cast in Season 11 as Dr. Ray Barnett and Scott Grimes became part of the main cast in Season 12 as Dr. Archie Morris. Season 13 saw the addition of John Stamos as Dr. Anthony "Tony" Gates, reprising a role he had originated in Season 12 when he portrayed Gates the paramedic/medical student. Season 15 saw the final additions to the main cast, with David Lyons signing on as Dr. Simon Brenner and Angela Bassett as Dr. Catherine "Cate" Banfield.
Notably, of the 26 main cast members that starred throughout ERs 15-season run, only seven were not featured in the final season: Gloria Reuben, Maria Bello, Kellie Martin, Michael Michele, Erik Palladino, Ming-Na, and Sharif Atkins. In addition, only four main cast members never made a return appearance of any type following their original stint: Maria Bello, Kellie Martin, Erik Palladino, and Mekhi Phifer.
Main characters
Timeline of County General Staff
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Alignbars = justify
DateFormat = mm/dd/yyyy
Period = from:09/19/1994 till:05/01/2009
TimeAxis = orientation:horizontal format:mm/dd/yyyy
ScaleMajor = unit:year increment:1 start:1995
ScaleMinor = unit:year increment:1 start:09/20/1994
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id:intern value:rgb legend:Intern
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id:schief value: rgb legend:Chief_of_Surgery
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id:nurse value:pink legend:Nurse
id:chargenurse value:magenta legend:Charge_Nurse
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at:09/21/1995 color:gray layer:back width:0.7
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bar:greene text:"Mark Greene"
bar:ross text:"Doug Ross"
bar:lewis text:"Susan Lewis"
bar:carter text:"John Carter"
bar:hathaway text:"Carol Hathaway"
bar:benton text:"Peter Benton"
bar:morgenstern text:"David Morgenstern"
bar:conni text:"Conni Oligario"
bar:lydia text:"Lydia Wright"
bar:malik text:"Malik McGrath"
bar:haleh text:"Haleh Adams"
bar:wendy text:"Wendy Goldman"
bar:lily text:"Lily Jarvik"
bar:hicks text:"Angela Hicks"
bar:chen text:"Jing-Mei Chen"
bar:boulet text:"Jeanie Boulet"
bar:swift text:"William Swift"
bar:chuny text:"Chuny Márquez"
bar:weaver text:"Kerry Weaver"
bar:tracy text:"Harper Tracy"
bar:edson text:"Dale Edson"
bar:gant text:"Dennis Gant"
bar:anspaugh text:"Donald Anspaugh"
bar:doyle text:"Maggie Doyle"
bar:keaton text:"Abby Keaton"
bar:delamico text:"Anna Del Amico"
bar:corday text:"Elizabeth Corday"
bar:henry text:"George Henry"
bar:romano text:"Robert Romano"
bar:west text:"Ellis West"
bar:yosh text:"Yosh Takata"
bar:knight text:"Lucy Knight"
bar:lynetteevans text:"Lynette Evans"
bar:lee text:"Amanda Lee"
bar:kovač text:"Luka Kovač"
bar:finch text:"Cleo Finch"
bar:malucci text:"Dave Malucci"
bar:lawrence text:"Gabe Lawrence"
bar:lockhart text:"Abby Lockhart"
bar:gallant text:"Michael Gallant"
bar:pratt text:"Greg Pratt"
bar:harkins text:"Erin Harkins"
bar:nathan text:"Paul Nathan"
bar:dorset text:"Eddie Dorset"
bar:rasgotra text:"Neela Rasgotra"
bar:morris text:"Archie Morris"
bar:cooper text:"Nick Cooper"
bar:sam text:"Sam Taggart"
bar:lester text:"Lester Kertzenstein"
bar:lawson text:"Jeremy Lawson"
bar:barnett text:"Ray Barnett"
bar:howard text:"Howard Ritzke"
bar:penny text:"Penny Nicholson"
bar:dubenko text:"Lucien Dubenko"
bar:figler text:"Jane Figler"
bar:scanlon text:"Jake Scanlon"
bar:inez text:"Inez"
bar:evepayton text:"Eve Payton"
bar:clemente text:"Victor Clemente"
bar:gates text:"Tony Gates"
bar:albright text:"Jessica Albright"
bar:hope text:"Hope Bobeck"
bar:crenshaw text:"Dustin Crenshaw"
bar:katey text:"Katey Alvaro"
bar:dawn text:"Dawn Archer"
bar:benparker text:"Ben Parker"
bar:maeleepark text:"Mae Lee Park"
bar:larryweston text:"Larry Weston"
bar:suri text:"Suri"
bar:moretti text:"Kevin Moretti"
bar:grady text:"Paul Grady"
bar:zelinsky text:"Harold Zelinsky"
bar:skyewexler text:"Skye Wexler"
bar:grossman text:"Barry Grossman"
bar:brenner text:"Simon Brenner"
bar:lavernestjohn text:"Laverne St. John"
bar:kayamontoya text:"Kaya Montoya"
bar:banfield text:"Cate Banfield"
bar:dariawade text:"Daria Wade"
bar:andrewwade text:"Andrew Wade"
bar:ryansanchez text:"Ryan Sánchez"
bar:tracymartin text:"Tracy Martin"
bar:chazpratt text:"Chaz Pratt"
bar:juliawise text:"Julia Wise"
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bar:season at:09/30/1999 text:Six
bar:season at:10/12/2000 text:Seven
bar:season at:09/27/2001 text:Eight
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bar:season at:09/25/2003 text:Ten
bar:season at:09/23/2004 text:Eleven
bar:season at:09/22/2005 text:Twelve
bar:season at:09/21/2006 text:Thirteen
bar:season at:09/27/2007 text:Fourteen
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bar:moretti from:05/10/2007 till:11/15/2007 color:erchief
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bar:grady from:10/09/2008 till:03/19/2009 color:doc
bar:zelinsky from:10/25/2007 till:04/17/2008 color:intern
bar:skyewexler from:11/01/2007 till:11/29/2007 color:erattend
bar:skyewexler from:11/29/2007 till:04/24/2008 color:erchief
bar:grossman from:11/15/2007 till:01/17/2008 color:sattend
bar:brenner from:04/10/2008 till:04/02/2009 color:erattend
bar:lavernestjohn from:04/10/2008 till:05/15/2008 color:student
bar:lavernestjohn from:10/09/2008 till:04/02/2009 color:intern
bar:kayamontoya from:05/08/2008 till:10/09/2008 color:student
bar:kayamontoya from:10/09/2008 till:12/04/2008 color:intern
bar:banfield from:10/09/2008 till:04/02/2009 color:erchief
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bar:andrewwade from:10/09/2008 till:03/19/2009 color:intern
bar:ryansanchez from:10/09/2008 till:04/02/2009 color:intern
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bar:juliawise from:04/02/2009 till:04/02/2009 color:intern
Departures from the main cast
's first departure from the show was in 1996, when her character, Susan Lewis, moved to Phoenix, Arizona, in the Season 3 episode "Union Station." In 2001, Stringfield returned to the series, reprising her role of Dr. Lewis, in the Season 8 episode "Never Say Never." She departed again after the Season 12 premiere, "Cañon City." This departure was not depicted, but was mentioned by character Kerry Weaver two episodes later, in "Man With No Name", as not coming in due to interviewing for a tenured position, having been denied tenure at County, and again later in "Wake Up," when Weaver explains that Susan accepted a tenure-track position at a hospital in Iowa City, Iowa. Stringfield returned once again for the series finale.After playing Anna Del Amico for one season, Maria Bello was not part of the ensemble cast when Season 5 began. Like Susan Lewis's second exit, her character's departure was mentioned but not depicted: in the season premiere, "Day for Knight," John Carter explains to new medical student Lucy Knight that the locker she is inheriting previously belonged to Del Amico, who returned to Philadelphia to rejoin a prestigious Pediatrics unit there and be with her family and boyfriend.
George Clooney left the show in the Season 5 episode "The Storm," when his character, Doug Ross, resigned before being fired for his involvement in a patient's death. Clooney made a cameo appearance in the Season 6 episode "Such Sweet Sorrow" when his character reunited with Carol Hathaway and appeared in the Season 15 episode "Old Times" where his character was the attending physician caring for a terminal organ donor in Seattle.
Gloria Reuben departed early in Season 6, in the episode "The Peace of Wild Things," when her character, Jeanie Boulet, decided to become a stay-at-home mom and care for her newly adopted HIV-positive baby. Reuben returned in the Season 14 episode "Status Quo" when her character's son was brought into the ER.
Kellie Martin, who played medical student Lucy Knight, left the series midway through Season 6 in the episode "All in The Family," when her character was killed by a patient with undiagnosed schizophrenia; his psychotic break occurred before a backed-up psychiatry department could arrive in the ER for a consult.
Julianna Margulies left the show at the end of Season 6, in the episode "Such Sweet Sorrow," when her character, Carol Hathaway, decided on the spur of the moment to go to Seattle, Washington, and reunite with Doug Ross, her true love and the father of her twin daughters. Margulies returned in the Season 15 episode "Old Times," with her character coordinating transplant efforts from a single organ donor in Seattle.
Erik Palladino departed early in Season 8, in the episode "Never Say Never," after his character, Dave Malucci, was fired by Kerry Weaver. While she initially fired him for having sex with an off-duty EMT and for an erroneous diagnosis resulting in a patient's death, her personal dislike for him was the real reason for his termination.
Eriq La Salle's character, Peter Benton, departed in the Season 8 episode "I'll Be Home for Christmas." He took a job with a set schedule at another hospital in order to spend more time with his son, Reese, and his girlfriend, former fellow ER doctor Cleo Finch. La Salle returned for two more episodes in Season 8 and then again for two episodes in Season 15, including the series finale.
Michael Michele's character, Cleo Finch, departed in the Season 8 episode "I'll Be Home for Christmas" with her boyfriend, and fellow doctor, Peter Benton, after having previously taken a job at the same hospital. Michele made a cameo appearance in the Season 8 episode "On the Beach" at Mark Greene's funeral. Cleo did not return to the show after that, but Peter confirmed they had married and were raising Reese together in the series finale.
Anthony Edwards's character, Mark Greene, died of a brain tumor in Season 8's penultimate episode, "On the Beach." Anthony Edwards was still credited in the Season 8 finale episode "Lockdown" as a tribute to what both the actor and character had meant to the series. Edwards returned in the Season 15 episode "Heal Thyself" where he appeared in multiple flashback scenes to give insight into the past of Catherine Banfield.
Paul McCrane's character, Robert Romano, whose arm had been severed just above the elbow by a helicopter's tail rotor in the Season 9 premiere "Chaos Theory," died in the Season 10 episode "Freefall." A helicopter that was taking off from the hospital roof was buffeted by strong winds, causing it to crash on the roof and plummet over the side of the building; it fell into a crowded ambulance bay and landed squarely on Romano. McCrane returned in the Season 15 episode "Heal Thyself" in a cameo set in 2002.
Sharif Atkins left the series in the Season 10 episode "Where There's Smoke," when his character, Michael Gallant, revealed that the Army was sending him to Iraq. Atkins returned for two episodes during Season 11 where he is seen serving duty in Iraq and then for four episodes during Season 12 when he marries Neela Rasgotra before redeploying to Iraq where he is killed by an improvised explosive device while serving a second tour.
Alex Kingston's character, Elizabeth Corday, departed early in Season 11 in the episode "Fear" after getting in trouble for performing an illegal organ donation procedure; rather than being summarily fired, County offered her a demotion to a non-tenured position, but she turned it down and opted to return to England instead. Kingston returned for two episodes in Season 15, including the series finale.
Ming-Na departed midway through Season 11 in the episode "Twas The Night" when her character, Jing-Mei Chen, resigned in order to take care of her ailing father, whom she later euthanized. This was the second time her character left County General: in Season 1, medical student "Deb" Chen appeared in an eight episode story arc which concluded with her leaving medical school after accidentally leaving a guide wire in a patient's chest, deciding she was better suited to research than to applied medicine.
Noah Wyle left in the Season 11 finale, "The [Show Must Go On (ER)|The Show Must Go On]." His character, John Carter, having received tenure at County, decided to reunite with his girlfriend Kem Likasu. Wyle returned for four episodes during Season 12 where he is seen practicing medicine in Darfur and then for five episodes during Season 15 when he needed a life-saving kidney transplant.
Laura Innes left midway through Season 13 in the episode "A House Divided," when a reluctant Luka Kovač was forced by budget cuts to fire her character, Kerry Weaver, due to her high salary. After bracing for a battle to keep her position, and in spite of the fact that Kovač realized he must find a way to keep her on staff, Weaver ultimately decided to resign from County and accept a job offer from a television station in Miami, Florida. Innes returned for two episodes in Season 15, including the series finale.
Shane West left in the Season 13 finale, "The Honeymoon Is Over," after his character, Ray Barnett, got hit by a truck, lost both his legs and returned to Baton Rouge with his mother to recuperate. West returned for three episodes during Season 15 when his character reunited with Neela Rasgotra.
Goran Višnjić, who played the character of Luka Kovač, departed in the Season 13 finale, "The Honeymoon Is Over," when he left for Croatia to care for his ailing father. He returned for seven episodes in Season 14 to wrap up his medical storyline and then made a brief appearance in the Season 15 episode "The Book of Abby" where he, his wife Abby Lockhart, and their son Joe embark on their new life together.
Mekhi Phifer departed in the Season 15 premiere, "Life After Death," when his character, Greg Pratt, died in the ER as the result of blast injuries suffered in an ambulance explosion.
Maura Tierney, who played the character of Abby Lockhart, departed early in Season 15 in the episode "The Book of Abby" with her husband Luka Kovač. Along with their son Joe, they presumably headed to Boston, where Abby had accepted a new job. She attempted to leave the ER quietly, however the rest of the staff made it known how much they would miss her. Nurse Haleh Adams showed Abby a hidden wall with the locker labels of all the past staff members since season one, with the exceptions of Carter and Boulet. Other names on the wall include departed former characters as well as some prominent writers and producers. Abby then left the ER and met Luka and Joe outside to embark on their new life together. Tierney returned in the Season 15 episode "Shifting Equilibrium" in a cameo during a phone conversation with Neela Rasgotra.
Supporting cast
Desk clerks and other non-medical hospital staff
| Actor/Actress | Character Name | Character Position | Years of Appearance |
| Jerry Markovic | Desk Clerk | 1994–1999, 2002–2006, 2008–2009 | |
| Timmy Rawlins | Desk Clerk | 1994–1995, 2006–2007 | |
| Harriet Spooner | Hospital Administrator | 1994–1999 | |
| Bogdana "Bob" Livetsky Romansky | ER Aide | 1994–1995 | |
| Diane Leeds | Risk Management Administrator | 1995 | |
| Rolando | Desk Clerk | 1995–1996 | |
| Miranda "Randi" Fronczak | Desk Clerk | 1995–2003 | |
| E. Ray "E-Ray" Bozman | Desk Clerk | 1995–1997 | |
| Miller | Hospital Chaplain | 1996 | |
| Nat | Custodian | 1997–2000 | |
| Cynthia Hooper | Desk Clerk | 1997–1998 | |
| Tony Fig | Transport Dispatcher | 1998–1999 | |
| Mobalage Ekabo | Custodian | 1999 | |
| Kobe "Kubby" Ekabo | Hospital Cafeteria Worker | 1999 | |
| Andrew "Andy" | Desk Clerk Temp | 1999–2000 | |
| Amira | Desk Clerk | 1999–2001, 2003–2005 | |
| Frank Martin | Desk Clerk | 1994, 2000–2009 | |
| Nicole | ER Aide | 2001 | |
| K.J. Thibeaux | Volunteer | 2005–2006 | |
| Angela Gilliam | Medical Staff Affairs Manager | 2006–2007 | |
| Javier | Desk Clerk | 2007–2008 | |
| Julia Dupree | Hospital Chaplain | 2007–2008 |
Nurses and other medical staff
| Actor/Actress | Character Name | Character Position | Years of Appearance |
| Conni Oligario | ER Nurse | 1994–2003 | |
| Janet | OR Nurse | 1994–2000 | |
| Lydia Wright | ER Nurse | 1994–2003, 2009 | |
| Malik McGrath | ER Nurse | 1994–2009 | |
| Haleh Adams | ER Nurse | 1994–2009 | |
| Wendy Goldman | ER Nurse | 1994–1997 | |
| Lily Jarvik | ER Nurse | 1994–2009 | |
| Shirley | Surgical Charge Nurse | 1995–2004, 2006–2009 | |
| Ethel "Chuny" Márquez | ER Nurse | 1995–2009 | |
| Bjerke | Nurse | 1996, 2000–2003 | |
| Kit | ICU, Pediatrics, and Surgical Nurse | 1996–2003, 2005, 2008 | |
| Rhonda Sterling | Temp Nurse | 1996 | |
| Dee McManus | Flight Nurse | 1996, 1999–2001, 2005, 2008 | |
| Mary Cain | Nursing Director | 1996–1997, 2002 | |
| Yosh Takata | ER Nurse | 1997–2003 | |
| Dori Kerns | ER Nurse | 1998–2006 | |
| Lynette Evans | Nurse Practitioner | 1998–1999 | |
| Sandra | OB Nurse | 1999–2001 | |
| Frank "Rambo" Bacon | ICU Nurse | 2000 | |
| Mary | ER Nurse | 2000–2008 | |
| Jacy | Nurse | 2001–2008 | |
| Corazon | ICU Nurse | 2001–2003 | |
| Duvata Mahal | ER Nurse | 2002–2005 | |
| Chuck Martin | Flight Nurse | 2003–2005 | |
| Anna Waldron | Nurse | 2004, 2005 | |
| Eve Peyton | Nurse Manager | 2005 | |
| Inez | ER Nurse | 2005–2006 | |
| Dawn Archer | ER Nurse | 2006–2009 | |
| Ben Parker | ER Nurse | 2006–2007 | |
| Suri | ER Nurse | 2007–2009 |
Secondary doctors and medical students
| Actor/Actress | Character Name | Character Position | Years of Appearance |
| Dr. Steve Flint | Chief of Radiology | 1994–1996, 1999–2000, 2002 | |
| Dr. David Morgenstern | Chief of Surgery, Chief of Emergency Medicine | 1994–1998, 2009 | |
| Dr. Wertz | Hospital Administrator | 1994 | |
| Dr. David "Div" Cvetic | Psychiatrist | 1994 | |
| Dr. Sarah Langworthy | Surgical Resident | 1994 | |
| Dr. Jack Kayson | Chief of Cardiology | 1994–1999, 2001–2005, 2007 | |
| Dr. John "Tag" Taglieri | Orthopedic Surgeon | 1994–1995 | |
| Dr. Alex Bradley | Chief of Staff | 1994–1996 | |
| Dr. Angela Hicks | Surgical Attending | 1994–1997 | |
| Dr. Janet Coburn | Chief of Obstetrics and Gynecology | 1994–2009 | |
| Dr. William "Wild Willy" Swift | Chief of Emergency Medicine | 1995, 1998, 2002 | |
| Harper Tracy | Medical Student | 1995–1996 | |
| Dr. Neil Bernstein | Chief of Pediatrics | 1995 | |
| Dr. Paul Myers | Psychiatrist | 1995, 1997–2000, 2003, 2005, 2008 | |
| Dr. Perry | Anesthesiologist | 1995–2004, 2006, 2008 | |
| Dr. Carl Vucelich | Cardiothoracic Surgeon | 1995–1996 | |
| Dr. Alice Upton | Pathologist | 1996, 1998, 2000–2001, 2003 | |
| Dr. Dale Edson | Surgical Intern/Resident | 1996–1999, 2001–2002 | |
| Dr. Dennis Gant | Surgical Intern | 1996–1997 | |
| Dr. Donald Anspaugh | Chief of Staff, General Surgeon | 1996–2008 | |
| Dr. Maggie Doyle | ER Intern/Resident | 1996–1999 | |
| Dr. Abby Keaton | Pediatric Surgeon | 1996–1997 | |
| Dr. Sam Breedlove | Surgeon | 1996–1997 | |
| Dr. Nina Pomerantz | Psychiatrist | 1997 | |
| Dr. Greg Fischer | Infectious Disease Specialist | 1997 | |
| Dr. Zagerby | Ophthalmologist | 1997, 2001 | |
| Dr. Tabash | Neonatologist | 1997–1998 | |
| George Henry | Medical Student | 1997, 2005 | |
| Ivan Fu | Medical Student | 1997 | |
| James Sasser | Medical Student | 1997 | |
| Dr. Ellis West | Associate ER Attending Physician | 1997–1998 | |
| Dr. David Kotlowitz | Surgeon | 1998 | |
| Dr. Max Rocher | Pediatrician | 1998 | |
| Dr. Alexander Babcock | Anesthesiologist | 1998–2002 | |
| Bernard Gamely | Medical Student | 1998 | |
| Dr. Amanda Lee | Chief of Emergency Medicine | 1998–1999 | |
| Dr. Graham Baker | Plastic Surgeon | 1999 | |
| Dr. Roger Julian | Chief of Genetics | 1999 | |
| Dr. Carl DeRaad | Chief of Psychiatry | 1999–2001, 2003 | |
| Dr. Gabriel "Gabe" Lawrence | ER Attending Physician | 1999 | |
| Dr. Kim Legaspi | Psychiatrist | 2000–2001 | |
| Dr. Rena Trujillo | Pediatrics Intern | 2001 | |
| Stanley Mao | Medical Student | 2001 | |
| Dr. Marty Kline | Orthopedic Surgeon | 2002–2003, 2006 | |
| Erin Harkins | Medical Student | 2002–2003 | |
| Paul Nathan | Medical Student | 2002 | |
| Dr. Eddie Dorset | Vascular Surgeon | 2003 | |
| Dr. Nick "Coop" Cooper | ER Resident | 2003 | |
| Andy | Medical Student | 2003 | |
| Sheila | Medical Student | 2003–2004 | |
| Lester Kertzenstein | Medical Student | 2003–2004 | |
| Dr. Megan Rabb | Director of Neonatology | 2004, 2006 | |
| David | Medical Student | 2004 | |
| Dr. Jeremy Lawson | Interventional Radiologist | 2004 | |
| Dr. Nelson | Psychiatrist | 2004, 2006 | |
| Dr. Howard Ritzke | ER Intern | 2004 | |
| Penny Nicholson | Medical Student | 2004–2006 | |
| Dr. Lucien Dubenko | Surgical Attending, Chief of Surgery | 2004–2009 | |
| Ludlow | Medical Student | 2004–2005 | |
| Dr. Jane Figler | ER Intern/Resident | 2004–2008 | |
| Jake Scanlon | Medical Student | 2004–2005 | |
| Dr. Jeremy Munson | ER Intern | 2005 | |
| Dr. Jim Babinski | ER Intern | 2005 | |
| Dr. Lana Clemons | ER Intern | 2005 | |
| Dr. Teddy Marsh | ER Intern | 2005 | |
| Dr. Victor Clemente | ER Attending Physician | 2005–2006 | |
| Dr. Ari | Anesthesiologist | 2005–2007 | |
| Dr. Jessica Albright | Surgical Chief Resident | 2005–2006 | |
| Dr. Dustin Crenshaw | Surgical Chief Resident, Surgical Attending | 2006–2008 | |
| Dr. Hope Bobeck | ER Intern | 2006–2007 | |
| Katey Alvaro | Medical Student | 2006–2007 | |
| Dr. Bettina DeJesus | Radiologist | 2006–2008 | |
| Mae Lee Park | Medical Student | 2006–2007 | |
| Dr. Larry Weston | ER Intern/Resident | 2007–2008 | |
| Dr. Kevin Moretti | Chief of Emergency Medicine | 2007, 2008 | |
| Dr. Paul Grady | ER Intern/Resident | 2007–2009 | |
| Dr. Harold Zelinsky | Surgical Intern | 2007–2008 | |
| Dr. Skye Wexler | Acting Chief of Emergency Medicine | 2007–2008 | |
| Dr. Barry Grossman | Orthopedic Surgeon | 2007–2008 | |
| Dr. Craig | Orthopedic Surgeon | 2008 | |
| Laverne St. John | Medical Student/ER Intern | 2008–2009 | |
| Kaya Montoya | Medical Student/ER Intern | 2008–2009 | |
| Dr. Daria Wade | ER Intern | 2008–2009 | |
| Dr. Andrew Wade | Surgical Intern | 2008–2009 | |
| Dr. Ryan Sánchez | ER Intern | 2008–2009 | |
| Dr. Tracy Martin | ER Intern | 2008–2009 | |
| Dr. Charles "Chaz" Pratt, Jr. | ER Intern | 2005–2009 | |
| Dr. Julia Wise | ER Intern | 2009 |
Firefighters, paramedics, police officers, and social workers
| Actor/Actress | Character Name | Character Position | Years of Appearance |
| Camacho | Paramedic | 1994–1995 | |
| Doris Pickman | Paramedic | 1994–2009 | |
| Officer Al Grabarsky | Police Officer | 1995–2000 | |
| Dwight Zadro | Paramedic | 1995–2009 | |
| Raul Melendez | Paramedic | 1995–1996 | |
| Ray "Shep" Shepard | Paramedic | 1995–1996 | |
| Officer Wilson | Police Officer | 1995, 1996, 1999–2000, 2001–2004, 2006 | |
| Pamela Olbes | Paramedic | 1995–2009 | |
| Reilly Brown | EMT | 1996 | |
| Brian Dumar | Paramedic | 1996–2009 | |
| Adele Newman | Social Services Liaison | 1997–2003 | |
| Lars Audia | EMT | 1997–1999 | |
| Allison Beaumont | Paramedic | 1997–1998 | |
| Greg Powell | Paramedic | 1997–1998 | |
| Captain Dannaker | Firefighter | 1998–2002 | |
| Morales | Paramedic | 1998–2009 | |
| Officer Reggie Moore | Police Officer | 1998–2000, 2008 | |
| Christine Harms | Paramedic | 1999–2009 | |
| Officer Tom Bennini | Police Officer | 2000 | |
| Officer Durcy | Police Officer | 2000–2002 | |
| Silva | Paramedic | 2000–2001 | |
| Lieutenant Sandy Lopez | Firefighter | 2001–2004 | |
| Niki Lumley | Paramedic | 2001–2003 | |
| Ken Sung | Social Worker | 2003–2004 | |
| Tony Bardelli | Paramedic | 2003–2009 | |
| Anders | Paramedic | 2004, 2009 | |
| Wendall Meade | Social Worker | 2004–2005 | |
| Officer Danny Yau | Police Officer | 2005–2006 | |
| Liz Dade | Social Worker | 2005–2006, 2007, 2008–2009 | |
| Officer Jones | Police Officer | 2005–2008 | |
| Officer Trudy Lange | Police Officer | 2006 | |
| Officer Rovner | Police Officer | 2006 | |
| Officer Hollis | Police Officer | 2006–2009 | |
| Reidy | Paramedic | 2006–2008 | |
| Wright | Paramedic | 2006–2007 | |
| Officer Litchman | Police Officer | 2007 | |
| Charles "Chaz" Pratt, Jr. | EMT | 2005–2009 | |
| Officer Newkirk | Police Officer | 2008–2009 | |
| Detective Claudia Diaz | Police Officer | 2009 | |
| Detective Trent Mallory | Police Officer | 2009 |
Family members
| Actor/Actress | Character Name | Character Position | Years of Appearance |
| Jennifer "Jenn" Greene | Wife of Mark Greene | 1994–1998, 2001–2002 | |
| Rachel Greene | Daughter of Mark Greene and Jennifer Greene | 1994–2000 | |
| Helen Hathaway | Mother of Carol Hathaway | 1994–1995 | |
| Walt Robbins | Brother-in-law of Peter Benton | 1994–1996 | |
| Chloe Lewis | Sister of Susan Lewis | 1994–1996, 2002 | |
| Mae Benton | Mother of Peter Benton | 1995–2001 | |
| Al Grabarsky | Boyfriend of Lydia Wright | 1995–2000 | |
| Jackie Robbins | Sister of Peter Benton | 1995–2001 | |
| Jesse Robbins | Nephew of Peter Benton | 1995 | |
| Joanie Robbins | Niece of Peter Benton | 1995 | |
| Steven Robbins | Nephew of Peter Benton | 1995 | |
| Al Boulet | Husband of Jeanie Boulet | 1995 | |
| Irene "Cookie" Lewis | Mother of Susan Lewis | 1995 | |
| Al Boulet | Husband of Jeanie Boulet | 1995–1997 | |
| Henry Lewis | Father of Susan Lewis | 1995–1996, 2004 | |
| Sarah Ross | Mother of Doug Ross | 1995–1996 | |
| Ray Ross | Father of Doug Ross | 1996 | |
| Carla Reece | Mother of Reese Benton | 1996–2001 | |
| Donald Anspaugh | Uncle of Simon Brenner | 1996–2008 | |
| Helen Hathaway | Mother of Carol Hathaway | 1996–1999 | |
| Millicent "Gamma" Carter | Grandmother of John Carter | 1997–2003 | |
| Ruth Greene | Mother of Mark Greene | 1997–1998 | |
| David Greene | Father of Mark Greene | 1997–2000 | |
| Chase Carter | Cousin of John Carter | 1997–1998, 2001 | |
| Scott Anspaugh | Son of Donald Anspaugh | 1998 | |
| John Truman Carter, Sr. | Grandfather of John Carter | 1998–2001 | |
| Patrice Robbins | Niece of Peter Benton | 1998 | |
| Charles Corday | Father of Elizabeth Corday | 1998, 2001–2002 | |
| Reggie Moore | Boyfriend of Jeanie Boulet | 1998–2000, 2008 | |
| Reese Benton | Son of Peter Benton | 1999–2001, 2009 | |
| Isabelle Corday | Mother of Elizabeth Corday | 2000–2002 | |
| Barbara Knight | Mother of Lucy Knight | 2000 | |
| Richard Lockhart | Ex-husband of Abby Lockhart | 2000–2003 | |
| Jesse Robbins | Nephew of Peter Benton | 2000 | |
| Maggie Wyczenski | Mother of Abby Lockhart | 2000–2006 | |
| Mrs. Chen | Mother of Jing-Mei Chen | 2000 | |
| Danijela Kovač | Wife of Luka Kovač | 2001 | |
| John "Jack" Carter, Jr. | Father of John Carter | 2001–2004 | |
| Eleanor Carter | Mother of John Carter | 2001 | |
| Rachel Greene | Daughter of Mark Greene and Jennifer Greene | 2001–2002, 2004, 2009 | |
| Sandy Lopez | Girlfriend of Kerry Weaver | 2001–2004 | |
| Ella Greene | Daughter of Mark Greene and Elizabeth Corday | 2002 | |
| Leon | Foster brother of Greg Pratt | 2002–2003 | |
| Eric Wyczenski | Brother of Abby Lockhart | 2002–2003 | |
| Mr. Chen | Father of Jing-Mei Chen | 2003–2004 | |
| Mrs. Chen | Mother of Jing-Mei Chen | 2003 | |
| Chuck Martin | Husband of Susan Lewis | 2003–2005 | |
| Alex Taggart | Son of Sam Taggart and Steve Curtis | 2003–2005 | |
| Makemba "Kem" Likasu | Girlfriend of John Carter | 2003–2005, 2009 | |
| Valerie Gallant | Sister of Michael Gallant | 2003–2004 | |
| Connie Martin | Wife of Frank Martin | 2004 | |
| Janie Martin | Daughter of Frank Martin and Connie Martin | 2004 | |
| Steve Curtis | Father of Alex Taggart | 2004 | |
| Ajay Rasgotra | Father of Neela Rasgotra | 2004 | |
| Mrs. Rasgotra | Mother of Neela Rasgotra | 2004 | |
| Mr. Chen | Father of Jing-Mei Chen | 2004 | |
| Helen Kingsley | Biological mother of Kerry Weaver | 2005 | |
| Steve Curtis | Father of Alex Taggart | 2005–2006 | |
| Charles "Charlie" Pratt, Sr. | Father of Greg Pratt | 2005 | |
| Charles "Chaz" Pratt, Jr. | Half-brother of Greg Pratt | 2005–2009 | |
| Alex Taggart | Son of Sam Taggart and Steve Curtis | 2005–2009 | |
| Evelyn Pratt | Stepmother of Greg Pratt | 2005 | |
| Jocelyn Pratt | Half-sister of Greg Pratt | 2005 | |
| James Gallant | Father of Michael Gallant | 2006 | |
| Gloria Gallant | Mother of Michael Gallant | 2006 | |
| Mrs. Markovic | Mother of Jerry Markovic | 2006 | |
| Meg Riley | Mother of Sarah Riley | 2006–2007 | |
| Sarah Riley | Daughter of Tony Gates | 2006–2009 | |
| Josip "Joe" Kovač | Son of Luka Kovač and Abby Lockhart | 2006–2009 | |
| Eddie Wyczenski | Father of Abby Lockhart | 2006–2007 | |
| Gracie | Grandmother of Sam Taggart | 2007 | |
| Mike Gates | Father of Tony Gates | 2007 | |
| Jacey Barnett | Mother of Ray Barnett | 2007 | |
| Niko Kovač | Brother of Luka Kovač | 2007 | |
| Carlos Moore | Son of Jeanie Boulet | 2008 | |
| Jaspreet | Cousin of Neela Rasgotra | 2008 | |
| Russell Banfield | Husband of Cate Banfield | 2008–2009 | |
| Mary Banfield | Mother-in-law of Cate Banfield | 2008 | |
| Daryl Banfield | Son of Cate Banfield and Russell Banfield | 2008 | |
| Johnny Morris | Cousin of Archie Morris | 2009 | |
| Kelly Taggart | Sister of Sam Taggart | 2009 | |
| Laura | Niece of Cate Banfield | 2009 | |
| Mary Taggart | Mother of Sam Taggart | 2009 |
Notable patients
| Actor/Actress | Character Name | Character Position | Years of Appearance |
| Mary "Madame X" Cavanaugh | Former singer who suffers from Alzheimer's disease | 1994 | |
| Patrick | Mentally disabled boy who occasionally wanders into the ER | 1994 | |
| Jodi O'Brien | Patient who died during childbirth under Dr. Mark Greene's care | 1995 | |
| Loretta Sweet | Sympathetic, down-and-out prostitute and single mother who has cervical cancer | 1995–1996 | |
| Charlene "Charlie" Chiemingo | Child prostitute who was being cared for by Dr. Doug Ross | 1996–1997 | |
| Pablo | Homeless man who sought care from County's medical staff | 1997–2003 | |
| Paul Sobriki | Schizophrenic patient who in a psychotic break stabbed both Dr. John Carter and Lucy Knight, the wounds leaving Carter injured and with life-long kidney problems and eventually resulted in Lucy's death | 2000, 2002 | |
| Bishop Lionel Stewart | Catholic bishop who helped Dr. Luka Kovač with his guilt about the death of his family | 2001 | |
| Charlie Metcalf | Alcoholic ex-con who comes to the ER with a cirrhosis-related illnesses | 2004 | |
| Jules "Ruby" Rubadoux | Patient with heart problems | 1995–1996, 2005 | |
| Dr. Nate Lennox | Former biochemistry professor with ALS disease | 2006 | |
| Curtis Ames | Patient who sued Dr. Kovač for malpractice after suffering from a paralyzing stroke while under his care for pneumonia | 2006–2007 |