Season 4 Episode 1
First Aired: September 1, 2008
Description: Michael uncovers unbelievable news in Los Angeles when he seeks revenge against Whistler and Gretchen for Saraâ€™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.