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Year of Hell, part I

Distressed at the loss of his family and an entire colony of his people by a hostile alien enemy, Krenim leader, Annorax, has mastered time manipulation and can obliterate history, making entire lifeforms and civilizations cease to have ever existed. In this way, he hopes to restore his loved ones by erasing the enemy that caused their deaths. His well-calculated plans are thwarted by the incursion of the U.S.S. Voyager. Captain Janeway and her crew come between Annorax and his plans, for which it seems he will make good on his promise to destroy the starship.

Voyager, seizoen 4