STILL FEELING RESPONSIBLE FOR PUTTING DON'S LIFE IN JEOPARDY, CHARLIE FOCUSES HIS EFFORTS ON HUNTING DOWN A SERIAL KILLER, ON THE 100TH EPISODE OF "NUMB3RS," FRIDAY, MAY 1

John Rubinstein ("Desperate Housewives," "CSI: Crime Scene Investigation") Guest Stars As Gene Evans, an Amateur Sleuth Who Helps Charlie's Investigation

Josh Gad Reprises His Role as Conspiracy Theorist Roy McGill, And Dan Martin Returns As Detective Cates

"Disturbed" - Still feeling responsible for Don's near-fatal stabbing, Charlie puts his focus into tracking down an unnoticed serial killer, with the agents revisiting math theories from when Charlie first started working with the team to help solve the case, on the 100th episode of NUMB3RS, Friday, May 1 (10:00-11:00 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Don Eppes: Rob Morrow
Charlie Eppes: David Krumholtz
Alan Eppes: Judd Hirsch
David Sinclair: Alimi Ballard
Amita Ramanujan: Navi Rawat
Colby Granger: Dylan Bruno
Nikki Betancourt: Sophina Brown
Liz Warner: Aya Sumika
Larry Fleinhart: Peter MacNicol

GUEST CAST:

Roy McGill: Josh Gad
Matt Li: Matthew Yang King
Robert Posdner: Brian Howe
Gene Evans: John Rubinstein
Peter Evans: Jack Shearer
Detective Cates: Dan Martin
Mark Horn: Daniel Sauli
Jack: Paul Messenger
Linda (Mother): Michelle Feynman
Leonard: Creagen Dow
Joe (Worker): J.D. Goldblatt
Woman: Erica Piccininni
Ralph: Keith Nobbs
Steve Savard: Brett Rickaby
Wife: Anne James

WRITTEN BY: Executive Producers Cheryl Heuton & Nicolas Falacci

DIRECTED BY: Dennis Smith

RATING: To Be Announced