Flung through a cosmic wormhole, American astronaut John Chriton finds himself fighting for his life in the middle of an alien prison break, inside Leviathan - a living spaceship - on the far side of the Galaxy. Joined by the warrior Ka D'Argo, Priestess Zhaan, Dominar Rygel XVI, the giant symbiote Pilot and the Peacekeeper Aeryn Sun; they all seek a way home which forges loyalty and a strong friendship.