In the first episode of season one, during a test flight designed to prove a scientific theory concerning the use of planetary gravity as a means for spaceship acceleration, a wormhole appears, and John and his "Farscape One" module are pulled into and through it. On his exit from the wormhole, he finds himself in the middle of a spaceship dogfight, during which he accidentally causes the death of Tauvo Crais, the brother of Peacekeeper captain Bialar Crais. Crichton's craft is pulled aboard a large spaceship named Moya, a Leviathan (a biomechanoid, i.e., a "living ship") where John meets his first aliens (Zhaan, D'Argo, Aeryn Sun and Rygel). Shortly after, John meets Bialar Crais, who wants revenge for his brother's death. John has to adapt quickly to a life with aliens, guns, and space travel, without the comfort of Earth culture. Toward the end of season one, Crichton encounters a mysterious alien race known only as The Ancients, who hide a repository of wormhole knowledge into his brain to guide him home, beginning a series-long chase by a Sebacean-Scarran hybrid Peacekeeper called Scorpius who hunts John and the rest of the Farscape crew to obtain that information.