Amy and a wounded Brad seek refuge with Brad's ex-military instructor; Dr. Lear reflects on the decisions that led him to involve Fanning in his research; testing of the virus on Anthony Carter begins.

Cast: Braxton Alexander, McKinley Belcher III, Max Bickelhaup, Brianna Brown, Caroline Chikezie, Emmanuelle Chriqui, Catherine Clifton, Henry Ian Cusick, Christopher T. Elliott, Jason Fuchs, Mark-Paul Gosselaar, Carson Holmes, Brianne Howey, Creighton Jones Jr., Cameron Lawson