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Tomorrow Is Yesterday 

The Enterprise is thrown back in time to 1960s Earth.


Michael O'Herlihy


D.C. Fontana, Gene Roddenberry (created by)




Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
Roger Perry ... Major Christopher
DeForest Kelley ... Dr. McCoy
Hal Lynch Hal Lynch ... Air Police Sergeant
Richard Merrifield ... Technician
John Winston John Winston ... Transporter Chief
Ed Peck ... Col. Fellini
James Doohan ... Scott
George Takei ... Sulu
Nichelle Nichols ... Uhura
Mark Dempsey Mark Dempsey ... Air Force Captain
Jim Spencer Jim Spencer ... Air Policeman
Sherri Townsend Sherri Townsend ... Crew Woman


When the Enterprise is flung back in time while trying to escape the gravitational pull of a black star, they find themselves in orbit around a 1960's Earth. When they are seen by a U.S. Air Force pilot, they beam him aboard but then face the dilemma of what to do with him as he learns more and more about the future. They have to review their initial decision to just keep him when historical records show that his yet-to-be-born son will lead Earth's first successful mission to probe Saturn. Spock devises a plan to do so while also erasing any memory of recent events. Written by garykmcd

Plot Summary | Plot Synopsis


TV-PG | See all certifications »

Did You Know?


Establishes the presence and role of a quartermaster on board the Enterprise. Kirk said to Spock (referring to Captain Christopher's flight suit), "Why don't you have the quartermaster issue him something more suitable?" Although much of the trappings of Starfleet are based on the 20th century U.S. Navy, in this respect it is different. In the U.S. Army the quartermaster is responsible for distributing supplies. However, in the U.S. Navy the quartermaster is responsible for navigation duties on the bridge under the supervision of the ship's navigator. See more »


Captain Christopher is seated in his jet fighter. When he is beamed on board, he is standing instead of being still in a seated position. See more »


[first lines]
Technician Webb: Captain?
Air Force Captain: What is it, Webb?
Technician Webb: A blip, sir. Just came on the screen.
Air Force Captain: How do you read it?
Technician Webb: Aircraft of some sort. By the size of it and the speed, it's not one of ours, sir. Doesn't even read like anything I've ever seen.
Air Force Captain: What was the approach?
Technician Webb: None, sir. It was just there, like it fell out of the sky or something.
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Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Referenced in Oblivion (2013) See more »


Music credited to Alexander Courage, although it strongly resembles the main title music for 'Hollow Triumph (1948)' by Sol Kaplan
Sung by Loulie Jean Norman
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User Reviews

Those incriminating pictures
24 January 2015 | by bkoganbingSee all my reviews

For once a science fiction prediction was not only right in advances in the future, but they got the time just about right. During a warp in the space time continuum the Enterprise is thrown back to the present and of course two years after this episode was broadcast humankind did indeed go to the moon.

It's a time about right and the Enterprise after a bumpy ride finds itself over America 1967. It's spotted as a UFO by alert Air Force pilot Roger Perry. He's transported to the Enterprise, his craft destroyed in the desert. But he's got some nasty incriminating pictures that will confirm all those UFO rumors and really mess up the future.

I'm not at all convinced of the science in what they do, but eventually things get back to how they're supposed to be. I believe this is the first time William Shatner and the rest were thrown back in Earth's history, but it certainly wouldn't be the last in the series.

As for Perry you can't really blame him for acting as his military training has taught him. Imagination isn't exactly built into it.

Funniest bit is when Air Force MP Sergeant Hal Lynch is also beamed up as he's cornered George Takei when an away team is beamed down to retrieve those incriminating pictures. His reactions are priceless.

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Release Date:

26 January 1967 (USA) See more »

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