Prizefighter Mason loses his opening fight so wife Rose leaves him for Hollywood. Without her around Mason trains and starts winning. Rose comes back and wants Mason to dump his manager Regan and replace him with her secret lover Lewis.

Lew Ayres
as Kid Mason

Robert Armstrong
as George Regan

Jean Harlow
as Rose Mason

John Miljan
as Paul H. Lewis

Edward Dillon
as Jeff

Mike Donlin
as McNeil

Morrie Cohan
as Rattler O'Keefe

Mary Doran
as Showgirl

Mildred Van Dorn
as Gladys DeVere

Ned Sparks
as Riley