Sara fears for her family's safety when she discovers the reason why Michael faked his death; Sucre helps Michael and Lincoln find a way home; Poseidon's true identity is revealed.

Cast: Crystal Balint, Marina Benedict, Craig Blair, Christian Michael Cooper, Rockmond Dunbar, Faical Elkihel, Mark Feuerstein, Robert Knepper, Curtis Lum, Wentworth Miller, Steve Mouzakis, Amaury Nolasco, Dominic Purcell, Sarah Wayne Callies