Leviathan

Leviathan is an enormous machine entity or sentient starship that collects sentient lifeforms, making a zoo in its interior. It was first encountered by the USS Voyager in the Delta Quadrant. Among the races it has collected, it has a group of Jem'Hadar who are not dependent on Ketracel White, and they 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 Will Decker and Ilia merging with V'ger, suggesting that Leviathan is somehow related to V'ger. It is quite possible that Leviathan was a member of the same machine race as V'ger. (VOY Comic: Leviathan (Comic)