PA: Due to some graphic content, viewer discretion is advised.

LINCOLN LEARNS WHY HE WAS FRAMED FOR MURDER; FOX RIVER TURNS INTO A MOB SCENE; SARAH HOLDS THE KEY TO THE ESCAPE PLAN; AND BELLICK MAY FINALLY DISCOVER THE "HOLE" TRUTH ON AN ALL-NEW "PRISON BREAK" MONDAY, APRIL 24, ON FOX

The mystery man reveals himself to Lincoln as well as his connection to some bad company; when Michael realizes Sara holds the key to the escape plan, he takes their relationship to another level; Fox River turns into a mob scene when a familiar face returns; Tweener must choose sides; and Bellick may finally discover the "hole" truth on the "The Key" episode of PRISON BREAK airing Monday, April 24 (8:00-9:00 PM ET/PT) on FOX. (PB-119) (TV-14 D, L, V)

Cast: Dominic Purcell as Lincoln Burrows; Wentworth Miller as Michael Scofield; Robin Tunney as Veronica Donovan; Amaury Nolasco as Fernando Sucre; Sarah Wayne Callies as Dr. Sara Tancredi; Stacy Keach as Warden Henry Pope; Wade Williams as Captain Brad Bellick; Paul Adelstein as Special Agent Paul Kellerman; Robert Knepper as T-Bag; Marshall Allman as LJ Burrows; Rockmond Dunbar as C-Note.

Guest Cast: Patricia Wettig as Vice President Caroline Reynolds; Michelle Forbes as Samantha Brinker; Frank Grillo as Nick Savrinn; Muse Watson as Charles Westmoreland; Lane Garrison as Tweener; Joseph Nunez as Manche; Holly Valance as Nika.