It's a Super Life
"It's a Super Life" is the thirteenth episode of the fifth season of the American television series Supergirl, based on the DC Comics character Kara Zor-El / Supergirl. It is set in the Arrowverse, sharing continuity with the other television series of the universe. The episode was written by Derek Simon and Nicki Holcomb from a story by showrunners Robert Rovner and Jessica Queller, directed by Jesse Warn, and is the series' 100th episode.
Melissa Benoist stars as Kara, and is joined by principal cast members Chyler Leigh, Katie McGrath, Jesse Rath, Nicole Maines, Azie Tesfai and David Harewood. The episode sees Kara travelling back to various points in time with Mxyzptlk's help to find a way to repair her relationship with Lena Luthor. Several former series regulars make guest appearances, including Chris Wood, Jeremy Jordan, Sam Witwer and Odette Annable.
"It's a Super Life" premiered on February 23, 2020, on The CW, and was watched by 0.66 million viewers with a 0.2 share among adults aged 18 to 49. The episode received generally positive reviews from critics.
Plot
Mxyzptlk approaches Kara Danvers to make amends for past transgressions and to give her a proposition: travel back in time and tell Lena Luthor she is Supergirl before Lex Luthor can, and ensure their friendship turns out differently; the changes will be cemented if Kara likes the outcome. He also explains that his previous appearance was a form that he took to impress her. Kara takes the offer after Alex Danvers and J'onn J'onzz give their approval.Kara first travels to the time before Kryptonite was released into the atmosphere and tells Lena, but this results in a timeline where Kara dies once the Kryptonite is released as Lena was not around to help cure her. This reality is undone. Kara next tells Lena when she told her to come clean about creating Kryptonite, but this results in a timeline where Reign survives longer than she originally did and kills Mon-El and Lena. Next, Kara tells Lena soon after the latter moved to National City. Everything goes well until Ben Lockwood and the Children of Liberty blackmail Kara into revealing herself as Supergirl to the world by kidnapping Lena before killing Kara's friends and family. This was done in retaliation to his family trying to put themselves in danger so that Supergirl would rescue them.
Following this, Mxyzptlk shows Kara a reality in which she and Lena did not meet, but his powers stop working, leaving them stranded. Nia Nal saves them from a Hope-Bot and brings them to Alex, J'onn, Winn Schott, Mon-El and Kelly Olsen. In this reality, Lena fought off Lex's assassination attempt on her and took him out at the cost of half of National City. She started using the Fifth Dimension to harness power for her Hope-Bots while getting Reign and a reprogrammed Brainiac 5 on her side. While her allies fight Reign and Brainiac 5, Supergirl confronts Lena while Mxyzptlk goes to look for a hat that was taken from him by Hat. Once he gets it, he undoes the reality.
Unable to change the timeline without adverse consequences, Kara decides to confront Lena as Mxyzptlk takes his leave while leaving a video about the day Lena and Lex started working together. Kara tells Lena that if she decides to forgive her, then she will be there for her, but if Lena continues to help in furthering Lex's plot, she will be forced to take action against Lena.