In a future society in the era of indefinite eugenics, humans are set on a life course depending on their DNA. Young Vincent Freeman is born with a condition that would prevent him from space travel, yet is determined to infiltrate the GATTACA space program.
The Daedalus is infected by a Wraith computer virus, while members of the expedition hope to return to Earth.
An Ancient communications device renders Daniel and Vala unconscious, sending their minds to another galaxy — where they inhabit the bodies of two people persecuted by the followers of an evil religion.
Tigh has to work with Lee to defeat a Cylon boarding party that threatens to take over Galactica and destroy the fleet.
Tommy has a chance at finding his kids with help from his oldest daughter. Chief Jerry asks his son for help when his wife’s condition worsens.
Tom and Diana track down a man to a museum, and during the chase, Tom finds a mysterious lab that only he can see. Later at the office, Tom finds that all his 4400 case files are gone, and no one has ever heard of the 4400.
The Daedalus arrives to defend Atlantis from the Wraith onslaught, but it may not be enough when the team discovers that an even larger armada is on the way.
An Air Force pilot attempts to reassemble SG-1 after they have gone their separate ways. An old “friend” arrives on Earth asking for Daniel’s help in finding an ancient treasure — and she won’t take no for an answer.
With Adama out of action, Colonel Tigh takes his position as commander of the Galactica. Boomer is in jail, and the cat’s out of the bag – she’s a Cylon.
Tommy asks his cousin for help in understanding the bizarre visions he’s been having. The crew tries to help Laura understand the essence of male comaraderie.