Michael seeks revenge against Whistler and Gretchen and uncovers unbelievable news. Lincoln and Michael are reunited with the gang and get an offer from a Homeland Security agent; Mahone experiences a devastating loss and T-Bag is deserted.
Michael and the team have a day to find the next cardholder or they risk going back to prison; Mahone seeks revenge on Wyatt, who is attempting to get information on Sara's whereabouts; T-Bag finds a new identity and gets a job offer.
Michael and co continue to hunt for the Company's cards containing the top secret information, but he, Lincoln and Sucre must crash a police benefit if they are to obtain the next card on the list.
One of the gang makes the ultimate sacrifice in a bid to reach Scylla, while, with Wyatt captured, Mahone reaps revenge for his son's murder.
A risky plan is hatched to get the final card from Pad Man, an uneasy alliance is formed with Gretchen, and there is a traitor in the ranks.