Star Trek (1966–1969)
36 user 9 critic

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.



, (created by)

Watch Now

With Prime Video





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


See all certifications »


Official Sites:



Release Date:

6 April 1967 (USA)  »

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:


| (flashbacks)

Aspect Ratio:

1.33 : 1
See  »

Did You Know?


When asked in February 26, 1992 interview whether the makers of this episode consciously intended it to have the contemporaneous anti-Vietnam-war movement as subtext, associate producer Robert H. Justman replied, "Of course we did." See more »


The Guardian of Forever first speaks in response to Kirk's questioning of its origin by saying "Then what is it?" by responding "A question." Moments earlier, Kirk had asked the same question in slightly different wording, "What is this thing Mr. Spock?" with no response, though this question was directed to Mr. Spock. See more »


Dr. McCoy: [tending to an injured and unconscious Sulu] There's a heart flutter. I'd better risk a few drops of cordrazine.
Capt. Kirk: That's tricky stuff - are you sure you want to risk...
Dr. McCoy: [McCoy administers the cordrazine, and Sulu's eyes open] You were about to make a medical comment, Jim?
Capt. Kirk: Who, me, Doctor?
See more »

Crazy Credits

Script Supervisor is written as "SCPIPT SUPERVISOR...GEORGE A. RUTTER" in the credits. This happened on at least two other episodes in season one. See more »


Referenced in Mission: Impossible: The Freeze (1968) See more »


Theme From Star Trek
Written by Alexander Courage
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Truly the best episode
25 December 2006 | by (New York, United States) – See all my reviews

"A City on The Edge of Forever" is truly the best Star Trek episode. In only it's first season, this Star Trek episode co-starred Joan Collins as Edith. It really brings out your true emotions after watching it. The acting is terrific as is the costumes and sets. It is cleverly written and directed. Even the musical scores are good. A lot of effort went into this episode and it paid off. I believe it may have even won an Emmy or was at least nominated for one. I recommend non-Trekie's to watch this episode, and when finished will be hooked on a great show. I love this one! I can watch this one over and over again. Live long and prosperous!

9 of 13 people found this review helpful.  Was this review helpful to you?

Contribute to This Page

Create a character page for: