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.
| Actor | Role |
|---|---|
 Mickey RooneyJohnny Casar | Johnny Casar |
 Pat O'BrienFather O'Hara | Father O'Hara |
 Beverly TylerMary Reeves | Mary Reeves |
 James BrownAllen | Allen |
 Ralph DumkeBruno Crystal | Bruno Crystal |
 Milburn StoneJeff Davis | Jeff Davis |
| BBert BegleyShilling | Shilling |
 Marilyn MonroePolly | Polly |
 Sam FlintDr. Barton | Dr. Barton |
 Glenn CorbettMack Miller | Mack Miller |
| JJohn HedloeUllman | Ullman |
 James AndersonStrong Arm Man (uncredited) | Strong Arm Man (uncredited) |
 Al HillPoliceman (uncredited) | Policeman (uncredited) |
| LLois JamesRoller Derby Girl (uncredited) | Roller Derby Girl (uncredited) |
 Kenner G. KempRoller Derby Spectator (uncredited) | Roller Derby Spectator (uncredited) |
 Frank MillsRoller Derby Spectator (uncredited) | Roller Derby Spectator (uncredited) |