Star Trek (1966–1969)
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The City on the Edge of Forever 

When a temporarily insane Dr. McCoy accidentally changes history and destroys his time, Kirk and Spock follow him to prevent the disaster, but the price to do so is high.



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Episode complete credited cast:
John Harmon ...
Hal Baylor ...
John Winston ...
Bart La Rue ...
Guardian (voice) (as Bartell La Rue)


When an accident causes Dr. McCoy to go temporarily insane, he escapes to a strange planet. There, the search party discovers a device left by a superior, vanished civilization, a time portal that plays the history of Earth for them - but then Bones jumps through it into the past, causing a change in history important enough to make the Enterprise vanish. Kirk and Spock, who fortunately made a tricorder recording, must attempt to go through to just before McCoy's arrival and stop him from changing history in the United States during the Great Depression, where they have no advanced technology available. Written by KGF Vissers

Plot Summary | Plot Synopsis


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Release Date:

6 April 1967 (USA)  »

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Sound Mix:


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Aspect Ratio:

1.33 : 1
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Did You Know?


Clark Gable, who was by no means a leading man in 1930, was not the original choice of reference. The final shooting draft of this script has Edith reference "a Richard Dix movie", but the crew on the set felt Dix's name wouldn't be familiar to viewers in the 1960s. See more »


When McCoy jumps through the portal, Capt Kirk is next seen finishing a dive to try to tackle him. However, he was 2-3 seconds late. He ended up 3 feet away from the portal with Spock between him and the portal. He probably would not have dived after nothing. See more »


Spock: Captain, I must have some platinum. A small block would be sufficient, five or six pounds. By passing certain circuits through there to be used as a duo-dynetic field core...
Capt. Kirk: [interrupting] Uh, Mr. Spock, I've brought you some assorted vegetables, baloney and a hard roll for myself, and I've spent the other nine tenths of our combined salaries for the last three days on filling this order for you. Mr. Spock, this bag does not contain platinum, silver or gold, nor is it likely to in the near ...
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Crazy Credits

The closing credits are set against a combination background of stills from that episode and previous episodes. See more »


Referenced in South Park: City on the Edge of Forever (1998) See more »


Theme From Star Trek
Written by Alexander Courage
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User Reviews

Shatner's finest performance of the series
22 March 2006 | by (United States) – See all my reviews

After Bones accidentally injects himself with a shot that causes him to have dementia, he jumps into a time-travel gateway and lands in New York in the 1930's. Kirk and Spock must go in after him and prevent him from doing something in the past that could alter the future. Kirk finds a love interest, played by Joan Collins, but comes to find out that she will play a key role in determining the outcome of Earth's future. Without spoiling it, lets just say it appears Kirk will never have a steady love relationship as long as he is captain. Great job by Shatner and leaves you numb at the end. He even uses the word "hell', which was probably a big deal on television in the late 60's.

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