- For other uses, see Leviathan.
Leviathan was an enormous machine entity or sentient starship which collected sentient lifeforms and placed them in a zoo in its interior. It was encountered by the USS Voyager in the Delta Quadrant. Among the races it collected were a group of Jem'Hadar who were not dependent on Ketracel White, and were presumably taken prior to the Jem'Hadar's enslavement by the Dominion.
Leviathan attempted to collect Voyager, along with other Delta Quadrant species. After escaping, the Voyager crew discovered a record in Leviathan's computer banks of Willard Decker and Ilia merging with V'Ger, suggesting that Leviathan is somehow related to V'Ger. It is possible that Leviathan was a member of the same machine race as V'Ger. (VOY comic: "Leviathan")