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
Did You Know?
The network heavily objected to Kirk's last line, "Let's get the hell out of here" and wanted it to be removed from the episode. The word "Hell" was used five times in The Original Series, the other four being Star Trek: Space Seed
(1967), when Kirk quotes Milton, "It is better to rule in Hell than serve in Heaven", Star Trek: The Alternative Factor
(1967), when Lazarus tells his counterpart, "I'll chase you into the very fires of hell!", and Star Trek: The Doomsday Machine
(1967), when Decker describes the berserker as "right out of hell." Kirk also says "What the hell is going on?" when he activates the Constellation viewscreen and sees the Enterprise being pulled into the maw of the Planet Killer. These are the only two times that the word was used as an expletive, rather than a reference to the domicile of the damned. See more
When McCoy arrives in 1930 NY, he believes he is in a fabricated environment and marvels at the detail of reconstruction. As he leans on a column less than 6 inches in diameter he remarks on the detail, "...even down to the cement columns." implying the free-standing column he is leaning on is made of cement. Clearly, the size and texture of the column would make it metal. A free-standing street column also would suggest a utility pole, none of which would be made of cement. See more
Save her, do as your heart tells you to do, and millions will die who did not die before.
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
Written by Ray Noble
, Jimmy Campbell
and Reginald Connelly
(as Reg Connelly)
Heard playing from the radio repair shop (with an uncredited vocal performer) and later as part of Fred Steiner's instrumental score (also uncredited)
Due to copyright issues, this music was replaced on some releases in the 1980s and 1990s See more