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Sam and Marcus look for the traitor who stole the nuclear launch key; when Prosser disobeys orders, he starts a conflict he can't control; Grace and James try to defuse a dangerous situation.
Andre Braugher
Captain Marcus Chaplin
Scott Speedman
XO Sam Kendal
Daisy Betts
Lieutenant Grace Shepard
Camille De Pazzis
Sophie Girard
Dichen Lachman
Tani Tumrenjack
Daniel Lissing
James King
Sahr Ngaujah
Julian Serrat
Autumn Reeser
Kylie Sinclair
Jessy Schram
Christine Kendal
Robert Patrick
Master Chief Joseph Prosser
Daniel Bess
Lieutenant Chris Cahill