Michael and Sara become more than "strangers on a train" en route to confront the President; Mahone recruits an new ally in his attempts to capture the fugitives; T-Bag puts on a happy face when the welcome wagon arrives; and a fourth escapee takes a fall.
Walker enters unfamiliar territory when a senator calls upon him to catch a computer hacker.
Walker, Trivette and Alex must protect a neighborhood against a gang that uses arson to intimidate witnesses and then tries to kill the arriving firefighters.
A Christmas party for orphans at C.D.'s sets the scene for Walker to tell a Ranger's version of Charles Dickens' A Christmas Carol.
