Star Trek: 15 Greatest Ever Time Travel Episodes

A great episode that adheres to the Rule Of Two Picards (only with Janeways instead), Endgame was the right way to end Voyager, with a future Admiral Janeway stealing technology to return to the past and offer herself a way out of the Delta Quadrant 16 years early. She also takes the opportunity to basically question her younger self's stoic altruism at the cost of her crew, which is an interesting development.

The episode seems to suggest something of a Sophie's Choice for Janeway - either leave the Delta Quadrant early and save some of her crew from death (or in the case of Tuvok, ruinous mental instability) or use the advanced tech from her future self to incapacitate the Borg and save countless lives. No prize for guessing which one she chooses.

The episode somewhat loses points for making Janeway's decision redundant: it's presented very much as an extreme either or situation that is then gotten around by Janeway simply deciding to try and have her cake and eat it. Ultimately it comes at the cost of her older self's life when she makes a heroic sacrifice and kills the Borg Queen in one fell swoop, but that would have happened anyway. And Voyager's escape from their own heroic sacrifice at the end is another big thing to have to accept.

But then it wouldn't be Voyager without contrivances, and the episode is an excellent one generally that is both an appropriate end for Janeway, her crew and for the Borg.