On the ship, Christa goes to get immunized. Ophelia accompanies her to prove that nothing is wrong with the shots. Ophelia takes the shot herself, has a seizure, and coll ...

One last mystery holds the key to saving the world, and Grace must choose how she spends her final days. ...

The government's final plans for a doomsday scenario set in motion a surprising chain of events for Grace, Darius and Harris. ...

Darius forms a dangerous alliance in order to destroy the dark money forces of Q17. Also, Grace takes action when surprising news jolts her world. ...

Darius, Grace and Harris uncover the darkest secret yet; Liam reconnects with Jillian. ...

Desperate to defuse a nuclear standoff, Liam gets help from an unlikely source. Also, with Darius missing, Harris and Grace take matters into their own hands. ...

Darius wants revenge against ReSyst despite the cost. Harris discovers a dark secret as Grace reveals her own secret. ...

Darius and Grace's relationship is tested when her secret is revealed. President Mackenzie tries to unify the fractured country. Re/Syst issues a deadly threat. ...

Grace forges a risky alliance with Alonzo. Harris and Darius must work together to confront Bennett's militia. ...

Grace embarks on a dangerous mission; meanwhile, Liam and Darius' relationship is tested. ...

Loyalties are tested when Grace is asked to lie under oath. Also, Darius tasks Liam with a dangerous mission, and a shocking act of violence plunges the nation into chaos ...

Darius and Grace must forge an emotional détente in order to get international cooperation. Also, Liam meets a new scientist with a mysterious past. ...

After a nuclear incident, the secret of the asteroid becomes public, setting the world on a dangerous course. Darius, Grace, Liam and Harris must adapt to new roles in an ...

Harris, Grace and Darius must topple the illegitimate government, and Darius makes final plans for the ark. ...

Darius, Grace and Harris join forces to prove the president was murdered. Also, Grace tells Zoe the truth. ...

Grace and Harris must forge an alliance when their children's lives are in jeopardy. Also, Liam presents Jillian with an unusual proposal. ...

Grace and Darius seek answers from the President and Harris discovers deadly secrets. ...

An assassin threatens Grace's life. Unlikely alliances are forged. ...

Darius and Grace are framed for murder and captured by the FSB. Liam tries to woo Jillian back to Tanz Industries. ...

Darius and Grace slip off to Russia to try an head off nuclear war. Liam finds solace with Amanda. ...

Darius recruits Grace, Harris and Liam for a dangerous mission, and Jillian confronts Liam about his secret. ...

In order to prove to Harris and Grace that he's not a traitor, Darius must reveal one of his most closely guarded secrets. Also, Liam helps Jillian adjust to her new job ...

To prove to Harris and Grace that he's not a traitor, Darius must reveal a closely guarded secret; Liam helps Jillian adjust to her new job at Tanz. ...

It's a race against time as Darius must accelerate his plan to stop the asteroid before the Pentagon shuts him down. Also, Grace has to make difficult decisions that coul ...

Darius and Liam work to invent a theoretically impossible piece of technology to divert the asteroid, and Grace risks everything to help Darius. Also, Liam heads home to ...

When MIT grad student Liam Cole (Charlie Rowe) discovers an asteroid is set to collide with Earth in 186 days, he joins forces with tech billionaire Darius Tanz (Santiago ...

The team evades justice with Bonnie and Clyde while they find out Flynn's target in the Depression-era South. ...