Judy and her grandpa run a trolley between a train depot and a ghost town in Nevada, near the California border. Three spies intent of tracking down an atomic missile gone astray arrive. When the trolley breaks down, Judy and Grandpa unwittingly install the engine from the nearby crashed missile.
| Actor | Role |
|---|---|
 Judy CanovaJudy Canova | Judy Canova |
 Ross ElliottDon Mack | Don Mack |
 Sig RumanStefan | Stefan |
 Jack KruschenHogar | Hogar |
 Andy ClydeGrandpa Rutherford Canova | Grandpa Rutherford Canova |
 Leon AskinOtto | Otto |
 Frank WilcoxProfessor | Professor |
 Emil SitkaTechnician | Technician |