Chuck learns a rock brought back from the moon links the Cadre to the Sentients.
A series of murders draws Odyssey 5 to a small town where Sentients are poisoning the water.
The ghostly apparition of a missing pilot haunts Sarah.
The team uncovers a Sentient plot that is using elementary-school students to create a Doomsday device.
Dr. Bertran attempts to download information directly from Taggart's brain.
The Odyssey crew must hunt and kill a synthetic; Taggart embarks on a personal Odyssey.
The crew scrambles to save Angela's father; Paige comes to terms with the mission; Sarah's relationship with Troy deepens.
A Sentient warns the crew of danger; Angela embarks on a romance with a baseball player.
A religious cult prepares for God's arrival on Earth; Angela wants to change history by preventing her father's death.
A Sentient disguised as an e-mail pen pal stalks Neil.
Marc faces expulsion from the astronaut training program; Paul takes Sarah to court; Taggart suffers from the effects of a virus.
Taggart, Mendel and Sarah search for a clue at a privately operated maximum-security prison.
A Sentient-created drug circulates at Neil's high school.
A mysterious being forces the team to relive its most personal encounters.
A niece with impaired hearing communicates with technology-enhanced ants.
The crew members lose their future memories, and only Mendel is left to save them.
Taggart and Neil attempt to scuttle a NASA satellite test; Sarah and Angela try to prevent a young girl's kidnapping.
A suicidal researcher believes artificial life has broken into cyberspace.
The crew must travel five years into the past to unravel the secret of Earth's destruction.