Star Trek

[Pirate Bill]

Originally Posted by BarTopDancer

I'm watching a Star Trek TNG episode where they run into another USS Enterprise that came through a time rift altering the course of history.

I just recently watched an episode of the animated series (which is accepted to be canon) where Spock uses the Time Guardian to go back in time and save his younger self to correct a change to the time line. But he doesn't put the time line back completely when he fails to save his pet saber-tooth-bear-thing. They mention that this may cause time ripples, but we never know what they might be.