Season 4 so far: Whistler and Mahone work for The Company to get Scylla, information that can bring down the company. Michael tracks Gretchen to LA to kill her, only to have her tell him she never killed Sara. Whistler tries to tell Michael his plan to take down The Company only to get shot in the head by The Company's hitman. While making a call to Lincoln, Michael and Lincoln get arrested by the FBI...and an agent there makes a deal with the brothers...that if they help him get Scylla, then they are free men, with their slates wiped clean. They instantly decline, and a close friend to Sara bails them out and takes them to where he was hiding Sara. During the reunion, the hitman is already there to kill them all. Now they have no choice but to take the deal, but this time, Michael isn't leaving Sara behind. The FBI agent gets Sucre, Bellick, and Mahone as well as a computer genius to help them. This time, the Company has sent out their ruthless enforcer, who killed Mahone's 6-year-old son to get to him. The FBI is skeptical about the project, so they try to pull the plug on it, right when the gang finds out that Scylla is not just a memory disc, but there are 6 of these discs that they need to get before they can break into a building, that they don't know what or where it is, to get the encoder in order to access the information. T-Bag has become an unknown complication because he took Whistler's position in that very company that The guys will need to get to after they get the cards.
This season is their best and different season so far, with different challenges and a new task for Michael. It's a must see, each episode is more intense and suspenseful than the next. I highly recommend this season. Plus, Michael and Sara get to be together...but something is wrong with Michael, and he knows it. He's hiding how often he gets bloody noses...