A ROUTINE FBI INVESTIGATION BECOMES PERSONAL FOR DON WHEN THE SUSPECTS THREATEN HIM AND THE EPPES FAMILY, ON "NUMB3RS," FRIDAY, MAY 5

Will Patton ("The Agency") Reprises His Role as Lieutenant Gary Walker

"Backscatter" -- Don and his family are in danger when they become the targets of the suspects Don and the team are investigating, on NUMB3RS, Friday, May 5 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Bill Eagles directed the episode written by Cheryl Heaton and Nicolas Falacci, two of the executive producers and co-creators of the series.

Will Patton ("The Agency") returns as Lieutenant Gary Walker, LAPD gang specialist, who joins the investigation.

An FBI investigation into a computer hacking scam, which taps into a bank's system to gain access to customer's identities and financial assets, becomes personal for Don when the Russian mob spearheading it comes after him and threatens the safety of Charlie and Alan.

Don Eppes: Rob Morrow
Charlie Eppes: David Krumholtz
Alan Eppes: Judd Hirsch
David Sinclair: Alimi Ballard
Larry Fleinhardt: Peter MacNicol
Megan Reeves: Diane Farr
Amita Ramajuan: Navi Rawat
Colby Granger: Dylan Bruno
Detective Gary Walker: Will Patton
Geoff Morton David: Aaron Baker
Yuri Koverchenko: Yasen Peyankov
Lamont: Ka'ramuu Kush
Colleen: Nancy Bell
Russian Hacker: Jonno Roberts
Daniel: Andrew Leeds
Paul: Michael Moore
Stendhauser: Megan Adele Lopez
Man #1: Bob Rusch
Student #1: Hettienne Park
Student #2: Dan Callaway
Front Row Student: Ashley Nicole Sherman
ATF Agent Annie Wilson: Lesley Fera
AUSA Robin Brooks: Michelle Nolden
ATF Supervisor Eric Turner: Markus Flanagan
Richard Davis: Matthew John Armstrong
Roy Mitchellv Joshua Leonard
Nikki Davis: Sandra Lindquist
Guard: Bobby Hall

RATING: To Be Announced