When an MIT grad student realises that an asteroid is set to collide with Earth in 186 days, he joins forces with a tech billionaire and the U.S. government in hopes of preventing a disaster; a conspiracy comes to light.

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

Darius accelerates his plan to stop the asteroid before the Pentagon shuts him down; Grace must make life and death decisions.

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.

While working to discover who killed his friend Lazlo, Darius is forced to reckon with his past, as Liam discovers who's been selling state secrets.

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