A Los Angeles fire captain (Roy Roberts) sends an arson-squad rookie (George Cooper) undercover.
as Russ Haines
as Capt. S. Taplinger
as Sgt. 'Berk' Berkeley
as E. V. Wessman
as Tony Polacheck
as Sam Polacheck
as Oscar Hollingsworth
as Fire Engineer Robby Rollins
as Bertha Polacheck
as Kenneth Bender
as Battalion Fire Chief
as Arthur Latch - Lab Technician
as Rodell - Arson Inspector (uncredited)
