The fourth and final installment of Prison Break including 24 episodes in which Michael hunts for Gretchen and Whistler in Los Angeles to avenge Sara's death but finds that she successfully managed to escape and is still alive. Through Bruce Bennett, the two reunite while in Panama, Sucre, Bellick and T-Bag escape from Sona after a riot. Seeing that the sole way they will truly be free, Michael and Lincoln avow to find Sara and bring down The Company.