Video: 'Classic Star Trek: The City on the Edge of Forever'

(Thursday, April 6, 1967, 8:30-9:30 p.m. EST) — Kirk and Spock must travel into the past in order to prevent a deranged McCoy from altering history and eradicating their own past on tonight’s episode of the American science fiction television series Star Trek on NBC.

In 2009, TV Guide ranked this episode #80 on its list of “TV’s Top 100 Episodes of All Time.”