1.28 The City on the Edge of Forever

While investigating mysterious time ripples in orbit of an unexplored planet, Dr. McCoy accidentally injects himself with an overdose of cordrazine. Escaping from the Enterprise, he jumps through a time portal called the Guardian of Forever, back to Earth's past, where he changes history erasing the Enterprise and the Federation from history.

The City on the Edge of Forever
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TOS Season 1, Episode 28

WRITTEN BY
Harlan Ellison
DIRECTED BY
Joseph Pevney

First Aired Apr 6, 1967
Stardate
3134.0