DON AND HIS TEAM INVESTIGATE A SERIES OF FIRES IN LOS ANGELES THAT ARE LINKED TO A RADICAL ENVIRONMENTAL GROUP, ON "NUMB3RS," FRIDAY, DEC. 16

"Bill Nye the Science Guy" Guest Stars

"Scorched" -- Don and his team must find the serial arsonist responsible for an innocent man's death, on NUMB3RS, Friday, Dec. 16 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Noberto Barba directed the episode written by Sean Crouch.

"Bill Nye the Science Guy" guest stars as Professor Waldie who helps Charlie and Larry recreate a backdraft in Cal Sci's combustion lab.

When a fire destroys an SUV dealership and kills a young salesman, Don and his team are called in as there is evidence the fire could be linked to a group of radical environmentalists. With the help of Cal Sci's Professor Waldie, Charlie is able to "fireprint" the fire which helps the FBI determine who is responsible.

Don Eppes: Rob Morrow
Charlie Eppes: David Krumholtz
Alan Eppes: Judd Hirsch
David Sinclair: Alimi Ballard
Larry Fleinhardt: Peter MacNicol
Megan Reeves: Diane Farr
Colby Granger: Dylan Bruno
Noah Stevens: Loren Dean
Alex Dewitt: Ian Unterman
Bianca Styles: Sophina Brown
Ethan: Blake Bashoff
Jake: A.J. Trauth
Bill Waldie: Bill Nye
Stendhauser: Susan Beaubain
Female Student: Rosalie Ward
Salesman: David O. Katz
Professor: Sean Smith

RATING: TVPG-LV