Johnny Casar runs away from the orphanage to start a successful career as a roller skater and after setbacks learns to curb his ruthlessness and ambition.
Acting
Rooney's chaotic energy barely contained on eight wheels.
Practical Effects
Actual roller derby footage — bruises included.

Director
Tay Garnett
Trivia, insights & behind the scenes
Rooney did most of his own skating after a two-week crash course, resulting in multiple on-set injuries.
Released when roller derby peaked nationally; the sport would nearly collapse within five years.