Crichton is reunited with Chiana and Rygel in an attempt to save a dying Leviathan from a group of mercenaries, who storm his new home in an attempt to harvest the living ship's flesh.
More of Moya's crew is reunited on a planet where Interion scientists are conducting an archeological dig. But their happy reunion is threatened when Commandant Grayza arrives and puts Crichton under a sensual spell.
The crew searches for Moya, but an emergency landing strands them on a desolate planet, where a group of mercenaries capture Rygel inside a lava-filled cavern.
The crew returns to Moya, where they find that Aeryn has returned -- struck with heat delirium. And when a massive alien vessel comes looking for her, Crichton and the others must outwit their opponent to save her life.
John and Chiana are trapped in a virtual reality simulation, and must win a game controlled by an unstable Stark -- while Moya may be in danger of attack from within.
Crichton falls into a wormhole and is found by an interdimensional being, who must decide whether or not to execute him because of the threat that his knowledge of wormholes presents to the universe.
Crichton returns to Earth, only to discover that he is more than 15 years in the past -- and his father has accepted command of the doomed Challenger mission.
Crichton makes his grand return home, where he and his alien friends introduce Earth to the larger universe that awaits them. Meanwhile, Grayza dispatches an alien chameleon to hunt Crichton.
Scorpius takes Crichton, D'Argo and Rygel to a rigorous training camp for mental discipline -- only to discover that Macton, the Peacekeeper who murdered D'Argo's wife, is also there.
The women of Moya visit a space station to secure a camouflage device for Moya, and stumble upon a secret meeting between Commandant Grayza and the Scarrans.
While the crew makes a futile search for Aeryn, Crichton watches a television show from Earth documenting the alien crew's recent visit -- and the human reaction to them.
Aeryn is interrogated by the Scarrans en route to the secret base at Katratzi. Crichton and Scorpius make a dangerous trip into an alternate reality to try and discover Katratzi's location.
Moya docks at a Scarran border station while in search of Aeryn, and must launch a daring rescue plan when they discover that her captors are there as well.
Crichton and his friends throw themselves into the middle of a summit between the Scarrans and Peacekeepers, in order to rescue Scorpius -- who is being tortured by Stark for the wormhole knowledge he might possess.
Uncertain of who their true allies are, the crew agrees to Scorpius' plan to destroy the source of Scarran power and escape the base with their lives. Grayza makes a fateful decision about her negotiations with the Scarrans.
When Moya's crew learns that the Scarrans have dispatched a ship to Earth as a prelude to invasion, Crichton must rely on Pilot to help him seal the wormhole that leads home.
