A freak accident sends the Enterprise hurtling through space and back in time to Earth in the late 1960s, where it is detected and classified by the U.S. military as an Unidentified Flying Object. Complicating matters further, Captain Kirk is forced to beam aboard an Air Force pilot named John Christopher, whose duty it will be to report everything he is now seeing about this vast starship from the future. Kirk and Spock must figure out a way to return the Enterprise to its own time, but not before they must return Captain Christopher to Earth without jeopardizing the history of the future. With the stakes so very high, it's remarkable how much levity is featured in "Tomorrow is Yesterday," the second Original Series teleplay written by Dorothy "D.C." Fontana. The result is "Star Trek's" first full-on comedy, and it's a delightful episode, but the humor never comes at the expense of the quality, the high drama and the superb performances that had come to represent the series at its finest.

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