Tomorrow Is Yesterday
"Tomorrow Is Yesterday" is the nineteenth episode of the Star Trek: [The Original Series season 1|first season] of the American science fiction television series Star Trek. Written by D. C. Fontana and directed by Michael O'Herlihy, it first aired on January 26, 1967. It was the first Star Trek episode to be written solely by a woman.
In the episode, the Enterprise is sent back in time to Earth in the 1960s, where the US Air Force detects it. The crew must correct the damage to the timeline and find a way to travel back to the future.
Plot
The USS Enterprise is sent back in time to Earth during the 1960s by the effects of a high-gravity "black star". Enterprise appears in Earth's upper atmosphere and is detected by military radar.When the Enterprise is labeled a UFO, a U.S. Air Force F-104 interceptor, piloted by Captain John Christopher, is scrambled to identify the craft. Fearing the fighter may be carrying nuclear weapons, Captain Kirk orders a tractor beam to be used on the jet, which causes it to break apart. To save the life of the pilot, they beam Christopher aboard the Enterprise.
Fearing Christopher could disrupt the timeline if returned to Earth, Kirk at first decides that the pilot must stay with the Enterprise. When Science Officer Spock later discovers that the pilot's as-yet-unborn son will play an important role in a future mission to Saturn, Kirk realizes he must return Christopher to Earth after all.
After learning of the existence of film taken of the Enterprise by Christopher's wing cameras, Kirk and Lt. Sulu beam down to the airbase to recover the film and any other evidence of their visit. They are caught by an United States [Air Force Security Forces|Air Policeman], who accidentally activates an emergency signal on Kirk's communicator and is beamed aboard. Kirk and Sulu continue their search, after which Kirk is captured again and Sulu escapes.
Spock, Sulu, and Christopher, who knows the base's layout, beam down to recover Kirk. After Kirk's guards are subdued, Christopher takes one of their guns and demands to be left behind. Spock, having anticipated Christopher would make such an attempt, appears behind Christopher and disables him with a Vulcan nerve pinch.
After they return to the ship, Spock and Chief Engineer Scott inform Kirk of a possible escape method by slingshotting around the Sun to break away and return to their time. The maneuver is risky, since even a small miscalculation could destroy the ship, or make them miss their own era.
Kirk approves the maneuver. Enterprise begins the maneuver and time on board begins to move backwards. Christopher is beamed back to his fighter jet at the instant he first encountered the Enterprise, preventing any film evidence of the ship being produced, and erasing his memory of his time on the Enterprise. The same is done with the Air Policeman. Enterprise then successfully returns to the 23rd century.
Production
The episode was originally conceived as part two to an earlier episode, "The Naked Time"; when the ending to that episode was revised, "Tomorrow Is Yesterday" was reworked as a stand-alone story.Associate producer Robert Justman devised the original idea for the story, and it was handed to Dorothy Fontana to create a teleplay. Justman received neither credit nor payment for doing so, whereas Roddenberry's agent charged the studio up to $3,000 for his own stories and rewrites.
Reception
In 2009, Tor.com rated it 5 out 6, noting that it depicted a sort of "hope and optimism and excitement about the new frontier" at a time before the first lunar landing mission. The day after the first airing of this episode saw the Apollo 1 disaster.Zack Handlen of The A.V. Club gave the episode a 'B−' rating, describing it as "so-so" and "passable".
SyFy ranked "Tomorrow Is Yesterday" as the 11th best time travel plot in Star Trek, in 2016.
In 2018, CBR ranked this one of the top-twenty time travel themed episodes of all Star Trek series.
In 2018, BuzzFeed listed this as example of an episode of a TV series that would serve as a better introduction to the series than the pilot. They point out that the franchise can be overwhelming to newcomers, and praised this episode as "beautiful, witty, and really makes you think".
In 2019, Nerdist ranked "Tomorrow Is Yesterday" the sixth best time travel episode of all Star Trek.