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Michael, Lincoln and the others get a new team member, Roland, and work to copy the data card. Wyatt continues his quest to find the brothers. T-Bag makes his way north.
Michael uncovers unbelievable news in Los Angeles when he seeks revenge against Whistler and Gretchen for Sara's death. Michael and Lincoln are reunited with the gang and receive an offer from a Homeland Security Agent they cannot refuse. Mahone suffers a devastating loss, and T-Bag is deserted during his flight to freedom.
Michael and the team have one day to find the next cardholder or they risk going back to prison. Mahone seeks revenge on Wyatt who is attempting to extract info on Sara's whereabouts, while T-Bag finds the gateway to his new identity and future.
The major storyline for the fourth season is about a team recruited by Homeland Security agent Don Self to obtain the Scylla. Although the team initially believes it to be The Company's "black book," it is later revealed to contain information on an advanced renewable power cell.