4x01 - "Scylla"

The new season starts off with a bit of a twist on the show. Instead of taking off where the previous season left off, we jump 3 weeks ahead. Michael's in Los Angeles and has tracked down Gretchen. Wanting to exact revenge on her for Sarah's death, he follows her, Whistler and Mahone to some sort of hotel where they're trying to get a info card known as "Scylla". Michael interupts the mission, and goes to kill Gretchen. She drops a bomb shell, though: Sarah's not dead.

Security shows up, but they all manage to escape.

Anywhoo, blah blah blah, what happens is Michael heads off to Chicago to find Sarah, and is nabbed by the police. He's then approached in gaol by a dude from Homeland security who suggests that Michael can help them track down Scylla and in return him and his friends all get their freedom back.

Somehow Sucre got out of Sona... and makes hsi way back to the US. As does T-bag, who is double crossed by some cayotes (saw that one coming...)