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.
Did You Know?
With regards to this episode, Joan Collins
has stated, "To this day, people still want to talk about that episode - some remember me for that more than anything else I've done. I am amazed at the enduring popularity of Star Trek and particularly of that episode." Collins adds, "At the time none of us would have predicted the longevity of the show. I couldn't be more pleased - or more honoured - to be part of Star Trek history." Ms. Collins' memory of her Trek experience seems hazy, however. In her 1985 autobiography, Past Imperfect (p. 248) she makes a few errors regarding the episode: for example, in addition to the common mistake of referring to Mr. Spock as Dr. Spock, she identifies her character as Edith Cleaver instead of Edith Keeler, and she also claims that Spock, not Kirk, allowed her character to be killed - a plot point that was not in the version of the script that was actually shot. Most significantly, she claims Edith tried to "prove to the world that Hitler was a nice guy." See more
When Kirk walks Edith home he tells her about a novel that will be written by someone from another planet, circling the far left star in Orion's Belt constellation which he points to. However, when the shot changes to the sky, it is overcast at dusk and no stars can be seen. 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
Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more
Referenced in Free Enterprise
Theme From Star Trek
Written by Alexander Courage See more