Star Trek: 15 Greatest Ever Time Travel Episodes
12. Timeless - Voyager
An excellent Voyager episode, Timeless memorable includes a still stunning crash sequence of the ship smashing onto an ice planet and killing everyone apart from Chakotay and Harry Kim (who caused it all). Then, after fifteen years of unbearable guilt, the pair - now Federation fugitives after defying orders - return to the ship in order to send a message through time to stop the past Harry Kim from messing everything up.
Okay, so it's something of a narrative cop out to write in reset buttons, but unlike other episodes, this actually felt earned and it added to the storyline rather than being a distracting f*ck you to the fans.
And of course, the cameo by Geordi La Forge was a lovely touch.