Crichton, now aboard a dying leviathan named Elac, encounters an alien named Sikozu who aids him in stopping the Grudeks who are intent on obtaining toubray (Leviathan neural cluster tissue).
The crew discovers how far Scorpius has fallen in the Peacekeeper ranks. They must find and activate all the probes to stop the magnetic storm on Arnesk, but someone doesn't want them stopped.
The crew is on the way to rendezvous with Moya. After ingesting a concoction of Noranti's they stop for a break on a planet. Rygel is captured and entombed in amber by raiders.
While Moya and her crew are resupplying on a generally xenophobic planet, Aeryn kills the next prefect, along with many bystanders and D'Argo, while under a strange form of suggestion.
The crew consume food, sharing amongst themselves. Although if not ingested by the same person, it becomes toxic. They must quickly find a cure or they'll die.
After accidentally returning to Earth, Crichton discovers he is in 1985 and he has altered the time line, causing his father to be scheduled to fly on the doomed shuttle 'Challenger'.
Crichton has arrived home, on Earth. Even though the Moya crew relaxes, on Earth and are treated as VIPs, Crichton can't seem to adjust to life on Earth. After all his adventures, can he still call Earth his home?
Moya takes on a new passenger, Talikaa, when Chiana insists upon it. However Talikaa turns out to be an alien creature in disguise and is intent on harvesting the crew's neural energy.
The males of the crew undergo some training. Crichton learns how to resist Scarran probes. While D'Argo learns some self control D'Argo encounters his wife's murderer, his wife's brother.
The women of Moya travel to a dead Leviathan to buy a sensor beacon for Moya which will allow her to appear to be a different ship. While there Aeryn and Sikozu spy on a secret meeting between the Peacekeepers and the Scarrans.
Crichton and Scorpius travel to one of the 'unrealized realities' where Crichton believes he heard Stark say "Katratzi." Meanwhile on a Scarran ship, Aeryn resists torture.
With their Crystherium stores low, the Scarrans must travel to Earth through a wormhole as those flowers grow there. With Pilots help, Crichton tries to collapse the wormhole leading back to Earth.