Main •
Santiago Cabrera as Darius Tanz, a billionaire scientist who is the founder and CEO of Tanz Industries and a pivotal player in the United States' defense against the impending asteroid. Darius briefly serves as the
Vice President of the United States before becoming president after President Mackenzie's assassination. •
Jennifer Finnigan as Grace Barrows, the
Pentagon press secretary, later senior advisor to President Mackenzie and later President Tanz; she has an intimate relationship with Harris Edwards, Deputy Secretary, and later, Secretary of Defense, and works with Darius to prevent the asteroid collision. •
Charlie Rowe as Liam Cole, a student at
MIT and later Darius' protégé; he is one of the first people outside the government to predict the asteroid's impending collision with Earth. He, his MIT professor and mentor Malcolm Croft and Darius work together on an
EM drive for a gravity tractor they hope to use to change the asteroid's course. •
Jacqueline Byers as Jillian Hayes, an investigative reporter who is searching for the truth about Darius' and the government's secrets. After learning about the asteroid, Amanda is assassinated before she can publish the story. •
Ian Anthony Dale as Harris Edwards, a graduate of the
United States Air Force Academy who now serves as the
United States Deputy Secretary of Defense and is one of the few people in Washington, D.C. who knows of the asteroid's impending impact. He is described as a skilled operative but an even better bureaucrat. After his superior is fired, he is promoted to
Secretary of Defense. •
Ashley Thomas as Alonzo Carter (season 2), a detective with the D.C. police who is investigating the disappearance of Claire Rayburn •
Melia Kreiling as Alycia Vrettou (season 2), •
Erica Luttrell as Claire Rayburn, Senior Adviser and later
White House Chief of Staff to President Monroe Bennett. •
Tovah Feldshuh as Pauline Mackenzie, the
President of the United States • Josette Jorge as Karissa (season 1), Darius' assistant •
Sasha Roiz as Monroe Bennett, the
vice president, and later president, of the United States •
Mark Moses as Hugh Keating, Grace's father and former CIA agent •
Brian Markinson as Randall Calhoun (season 1), the
United States Secretary of Defense who is later fired by President Mackenzie and replaced by Harris Edwards. •
Jeffrey Nordling as Daniel Hayes (season 1), Jillian's father and a bookseller •
John Noble as Nicholas Tanz, aka Tess, Darius' first love •
André Dae Kim as Dylan Edwards (recurring season 1, guest season 2), Harris' son and a member of the hacker organization RE/SYST •
Taylor Cole as Fiona Lane (guest season 1; recurring season 2), the
White House Counsel •
Anjali Jay as Dr. Rosetta Stendahl (season 2), an old friend of Darius' and a brilliant scientist. She joins Darius and leads the project to prepare a rail-gun intended to help divert the asteroid. •
Luke Arnold as Bass Shepherd (season 2), the spiritual leader of Children of Planet Earth (COPE), a support group that Jillian joins •
Manoj Sood as Dr. Chandra (season 2), an international specialist in Orbital Dynamics and General Purturbation Theory •
James Lesure as Trey Thompson (season 2), a two-term
congressman and former
NASA pilot who is later named
Vice President under Tanz. ==Episodes==