After engineering an escape from the hellish Panamanian prison Sona, brothers Michael Scofield (Wentworth Miller) and Lincoln Burrows (Dominic Purcell) are determined to seek justice against The Company, the shadowy group responsible for destroying their lives and killing the woman Michael loves, Dr. Sara Tancredi (Sarah Wayne Callies). During their quest for vengeance, Michael's world is turned upside down when he learns that Sara is still alive. Realizing the only way they will truly be free, Michael and Lincoln avenge to find Sara and take down The Company. With the help of a government handler, they assemble a group of allies and familiar faces including corrupt FBI agent Alexander Mahone (William Fichtner), Fernando Sucre (Amaury Nolasco) and Brad Bellick (Wade Williams) to aid in their seemingly impossible task. Unfortunately for the brothers, they must also enlist 'T-Bag' (Robert Knepper), who unknowingly possesses a vital clue to help them pull off their most difficult challenge yet. They'll soon discover the only thing harder than breaking out is breaking in. Featuring all 20 nail-biting full-hour episodes on a six-disc DVD set, Season 4 (2008-9) includes cast and crew commentaries, unseen footage, and a preview of the direct-to-DVD Prison Break movie.