Cast
Sol Murgi
Fight Spectator (uncredited)
Don 'Red' Barry
Mike O'Hara, "King Cobra"
Michael Vallon
Bettor
Sam Flint
Doctor
Chester Clute
Timid Man
Stanley Price
Fight Spectator (uncredited)
John Cason
Tiger Johnson
Harvey Parry
Bit Role (uncredited)
Tom Brown
Joe O'Hara
Al Bain
Fight Spectator (uncredited)
Joseph Crehan
Oscar Brannigan
Margia Dean
Joy White
Noble 'Kid' Chissell
Fight Spectator (uncredited)
Sheila Ryan
Janet 'J.L.' Brannigan
William Edmunds
Professor Berger
Lyle Talbot
Radio Announcer
Jack Perry
Trainer (uncredited)
Charles Morton
Fight Spectator (uncredited)