Star Trek: Voyager, season 7
Endgame
Summary
In the future where it took Voyager 23 years to get home, Admiral Janeway devises a plan to alter history. As the crew enters a final showdown with the Borg, the two Janeways implement a risky plan to take out one of the six Borg Transwarp Hubs in the galaxy and simultaneously cross the transwarp threshold to get home. * Originally shown as a two-hour series finale, but in syndication is shown as two separate episodes.
Summary from Wikipedia, CC BY-SA 4.0.
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