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