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 US during the Great Depression, where they have no advanced technology available. Written by
Did You Know?
In Harlan Ellison
's original story Beckwith's change of the past is revealed by members of the Enterprise team who are beamed back to the ship, only to find it is now a pirate vessel named The Condor. This idea was later used in Star Trek: Mirror, Mirror
(1967). See more
Script Supervisor is written as "SCPIPT SUPERVISOR...GEORGE A. RUTTER" in the credits. See more
[Having arrived in Earth's distant past, Captain Kirk steals clothing so he and Spock can blend in but is halted by the sudden appearance of a policeman
[seeing Kirk with an armload of clothing
You're a police officer. I recognize the traditional accoutrements.
[in regards to his own appearance
You were saying you'll have no trouble explaining it.
[on the spot to explain Spock's alien features
My friend... is obviously Chinese. I see you've noticed the ears. They're... actually easy to ...
The closing credits are set against a combination background of stills from that episode and previous episodes. See more