Series: Star Trek: The Original Series
Season 1, Episode 19
Original Air Date: January 16, 1967
|via Memory Alpha
That said, I quite enjoyed "Tomorrow Is Yesterday," definitely one of my favorite episodes so far. I don't mean to say that there are no problems as far as the time travel is concerned. We'll get to that in a bit. First, the story:
The Enterprise is thrown back in time to Earth, 1969. When the ship is detected as a UFO by a US Air Force base, our heroes beam Captain John Christopher aboard just before the tractor beam destroys his plane. The dilemma is clear. Christopher can't be allowed to return for fear of corrupting the time line - cruel, though acceptable reasoning by my time travel standards. But the crew discover they must return him because his future offspring are critical to the future of space exploration. Combine this with the needs to clean up all other evidence of the Enterprise's appearance in the 20th century and return the ship to its own time and you've got a fantastic set up.
The trouble comes when Captain Christopher and an air policeman - who is also mistakenly abducted - are returned to their own timelines. Basically, each is beamed back into their own selves at the moment immediately prior to their contact with the Enterprise crew with no apparent memory of their adventures. It's the loss of memory that bothers me. After all, our heroes maintain recollection of what happened. Why wouldn't Christopher and the policeman? Or do they remember, but without any concrete proof no one will believe them so the risk of paradox is negated?
Too many questions. Time travel stories need to be tidy and this one wasn't, even if it was highly entertaining anyway.
***END OF SPOILER***
|via Memory Alpha