Gunner O'Hara is about to be released from prison after serving a five-year sentence, and receives a visit from his twin brother John, a divinity student soon to be ordained as a priest. Aware that Gunner plans to resume his criminal career, John decides to stop him.
| Actor | Role |
|---|---|
 Sean McCloryGunner O'Hara / John O'Hara | Gunner O'Hara / John O'Hara |
| JJoanne JordanJoan Marlowe | Joan Marlowe |
 Ray MiddletonPolice Chief Corbett | Police Chief Corbett |
 Jaclynne GreeneGilda | Gilda |
 Lee Van CleefFlash Logan | Flash Logan |
 James GriffithSmiley Di Angelo | Smiley Di Angelo |
 Hugh SandersTim Donovan | Tim Donovan |
 Roy RobertsDistrict Attorney | District Attorney |
 Peter MamakosCharlie Green | Charlie Green |
| RRobert CrossonDanny Marlowe | Danny Marlowe |
 Frank GerstleDum-Dum Wilson | Dum-Dum Wilson |
 Willis BoucheyWarden Lewis J. Johnson | Warden Lewis J. Johnson |
 Philip Van ZandtJake Freeman | Jake Freeman |
 Don HaggertyPrison Guard (uncredited) | Prison Guard (uncredited) |