Mark Moses as Hugh Keating, Grace's father and former CIA agent.

Sasha Roiz as Monroe Bennett, the vice president, and later president, of the United States.

Josette Jorge as Karissa (season 1), Darius' assistant.

Tovah Feldshuh as Pauline Mackenzie, the President of the United States.Erica Luttrell as Claire Rayburn, Senior Adviser and later White House Chief of Staff to President Monroe Bennett.Dennis Boutsikaris as Malcolm Croft, a professor at MIT and Liam's mentor.Melia Kreiling as Alycia Vrettou (season 2), a brilliant computer scientist, former protégé of Darius Tanz, and member of RE/SYST, leading an international group of captive scientists to come up with a plan to prevent the asteroid collision.police who is investigating the disappearance of Claire Rayburn Ashley Thomas as Alonzo Carter (season 2), a detective with the D.C.After his superior is fired, he is promoted to Secretary of Defense. He is described as a skilled operative but an even better bureaucrat. who knows of the asteroid's impending impact. 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.After learning about the asteroid, Amanda is assassinated before she can publish the story. Shazi Raja as Amanda Neel (season 1), an investigative reporter who is searching for the truth about Darius' and the government's secrets.Rachel Drance as Zoe Barrows (season 1 recurring season 2), Grace's daughter.Jacqueline Byers as Jillian Hayes, a science fiction writer from Boston who becomes involved with Liam and is later chosen by Darius to pick 160 survivors to leave Earth if the asteroid collision cannot be stopped.He and Darius work together on an EM drive for a gravity tractor they hope to use to change the asteroid's course.

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.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.Darius briefly serves as the Vice President of the United States before becoming president after President Mackenzie's assassination. 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.The show looks at how different individuals and groups of people react to the impending doom. The show centers on the discovery of an asteroid that will impact the Earth in just six months, highlighting the attempts to prevent it and its worldwide ramifications.

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