A rookie cop tries to prove his friend is innocent of a robbery, despite the police commissioner's objection to his use of a trained German Shepherd dog named Ace.
| Actor | Role |
|---|---|
 Tim HoltClem Maitland | Clem Maitland |
 Virginia WeidlerNicey | Nicey |
 Janet ShawGerry Lane | Gerry Lane |
 Frank M. ThomasPolice Chief Gordon H. Lane | Police Chief Gordon H. Lane |
 Robert Emmett KeaneCommissioner Hugh Thomas | Commissioner Hugh Thomas |
 Monte MontagueTom Hadley / Monte, a Henchman | Tom Hadley / Monte, a Henchman |
 Don BrodieFrank 'Frankie' Dixon | Frank 'Frankie' Dixon |
 Ralf HaroldeJoey Anderman, Roadhouse Owner | Joey Anderman, Roadhouse Owner |
 Muriel EvansFern, Joey's Girl | Fern, Joey's Girl |
| AAce the Wonder DogAce | Ace |