Mahone and Kellerman determine to keep Michael and Sarah apart; a father figure helps Lincoln; L.J. meets a long-lost relative; Sucre plans a getaway with Maricruz; T-Bag runs into a familiar face.
Triggers are pulled that strengthen the MC, but also threaten to destroy it.
While Magnum and Higgins are undercover as a couple on a tour working a case, they must switch gears when someone on the trip is murdered.
Walker gets ex-con pal Charlie Brooks (Terry Kiser) to impersonate a look-alike crime boss in exchange for amnesty.
Walker and Alex's plane crashes to the bottom of a lake on their way to deliver evidence to prosecutors in a serial murder case.