CHARLIE AND DON BUTT HEADS AFTER ONE OF CHARLIE'S COLLEAGUES IS ARRESTED BECAUSE OF HIS SUSPECTED TIES TO A TERRORIST GROUP, ON A REBROADCAST OF THE FOURTH SEASON FINALE OF "NUMB3RS," FRIDAY, SEPT. 19

Zeljko Ivanek ("24") Guest Stars as Special Agent William Fraley

"When Worlds Collide" - Don and Charlie find themselves in conflict over their differing beliefs as they investigate a case involving national security. Meanwhile, Megan faces a crisis of conscience and leaves the team, on a rebroadcast of the fourth season finale of NUMB3RS, Friday, Sept. 19 (9:00-10:00 PM, ET/PT) on the CBS Television Network. (Originally broadcast 5/16/08)

SERIES REGULARS:

Don Eppes: Rob Morrow
Charlie Eppes: David Krumholtz
Alan Eppes: Judd Hirsch
David Sinclair: Alimi Ballard
Megan Reeves: Diane Farr
Amita Ramanujan: Navi Rawat
Colby Granger: Dylan Bruno

GUEST CAST:

William Fraley: Zeljko Ivanek
Phil Sanjrani: Ravi Kapoor
Shane O'Hanahan: Shawn Doyle
Asha Rafiq: Meera Simhan
Shaza Rafiq: Tiya Sircar
Hadi Rafiq: Shan Ali
Benjamin Rajar: Nick Jaine
Max Flaherty: Paul Vincent O'Connor
CIA Officer: Kevin Symons
Cop: Michael Balsley
Attorney: John Hawkinson
Sport Coat #1: David Valcin
The Real Hassan: Mazari Barber Ali
Kaleen Rafiq: Roman Mitichyan

WRITTEN BY: Executive Producers Cheryl Heuton & Nicolas Falacci

DIRECTED BY: John Behring

RATING: TVPG-LV