Booth delves into his past when dead bodies start turning up around Washington, D.C., that are linked to his old Army unit. Meanwhile, Brennan worries about her father but wonders if she can trust him after he doesn't tell her about a medical procedure.

Cast: Emily Deschanel, David Boreanaz, Michaela Conlin, Tamara Taylor, T.J. Thyne, John Boyd, Eugene Byrd, Eddie McClintock, Casey O'Neill, Brigitte Valdez