The first part of the two hour season premiere for season 4. As the fourth season opens, Michael is in L.A., looking to even the score with Gretchen for Sara’s death, while Gretchen, Whistler and Mahone go about Company business. And in Panama, Sona has burned to the ground, with T-Bag, Bellick and Sucre unaccounted for. Meanwhile, Lincoln, LJ and Sofia are settling in as a family. Wyatt: Cress Williams. Pam Mahone: Callie Thorne. Don Self: Michael Rapaport.