Sean Walker (Jason Ritter), stumbles into a national conspiracy after his girlfriend Leila (Sarah Roemer) mysteriously disappears from a Caribbean cruise. Elsewhere, President Elias Martinez (Blair Underwood)... more
As the shockwave of the plane dissipates, the conspiracy widens. more
The mystery deepens as President Martinez' administration unveils a new plan to force Sophia into revealing information. more
Grappling with a mysterious biological threat, The White House's only hope is to crack Sophia during an interrogation. more
The biological threat intensifies; Sterling faces a difficult negotiation with Thomas, while Simon appeals to Sophia to turn on Thomas. more
Family secrets interfere in the hunt for the truth -- Paula Malcomson ("Caprica," "Deadwood") Guest Stars. more
Desperate times call for desperate measures. President Martinez demands answers. more
Both Sophia and President Martinez deal with traitors in their respective houses. more
Martinez tries to root out a traitor, Thomas unveils a shocking new plan, and Leila and Sean are hunted by mercenaries as they search for Samantha. more
Martinez decrypts a message that has alarming implications for the future. more
Martinez decrypts a message that has alarming implications for the future. more
Sean forces Vicky to work with him in his attempt to get to Dempsey. Their first step is questioning Jarvis about Dempsey's whereabouts. Thomas tells the sleepers that all of their people must move to... more
Simon tries to stop Sophia from destroying human civilization. Dempsey's men capture Vicky. Martinez suspects his wife might be a Sleeper. more
Sophia hatches an evil plot while Sean gets closer to tracking down Dempsey! more
Sean and Vicky try to stop an act of unimaginable terror while tensions within the Sleeper community escalate. more
Christina plays a key role in saving her husband while Sean and Vicky fail to stop the virus from getting to Sophia. more
While Sophia moves forward with a deadly plot, Sean finally reunites with Leila. more