 Billy MauchPenrod | Penrod |
| RRobert J. MauchDanny | Danny |
 Dick PurcellTex Boyden | Tex Boyden |
 Gene LockhartMr. Schofield | Mr. Schofield |
 Kathleen LockhartMrs. Schofield | Mrs. Schofield |
 Hugh O'ConnellProfessor Caligostro | Professor Caligostro |
 Charles HaltonMr. Bitts | Mr. Bitts |
| BBernice PilotDelia | Delia |
| JJackie MorrowRodney Bitts | Rodney Bitts |
 Philip HurlicVerman | Verman |
 Carole LandisGirl at Fair (uncredited) | Girl at Fair (uncredited) |
 Sonny BuppMonk (uncredited) | Monk (uncredited) |
 Glen CavenderTruck Driver Giving Penrod a Lift (uncredited) | Truck Driver Giving Penrod a Lift (uncredited) |
| JJames ConatyDinner Guest (uncredited) | Dinner Guest (uncredited) |
| JJack CunninghamJack (uncredited) | Jack (uncredited) |
| GGloria FisherAmy Perkins (uncredited) | Amy Perkins (uncredited) |
| JJack A. GoodrichAttendant (uncredited) | Attendant (uncredited) |
| EEddie GrahamSecond Reporter (uncredited) | Second Reporter (uncredited) |
 John HarronSpieler at Carnival (uncredited) | Spieler at Carnival (uncredited) |
 Peter Lind HayesWeight Guesser (uncredited) | Weight Guesser (uncredited) |
 Stuart HolmesBanker Dinner Guest (uncredited) | Banker Dinner Guest (uncredited) |
| DDon HulbertChuck (uncredited) | Chuck (uncredited) |
| PPhyllis Hurst(uncredited) | (uncredited) |
 Frank JaquetSheriff Bart (uncredited) | Sheriff Bart (uncredited) |
| MMuriel Kearney(uncredited) | (uncredited) |
 Ethan LaidlawBus Driver (uncredited) | Bus Driver (uncredited) |
| BBilly LechnerDonald (uncredited) | Donald (uncredited) |
| AAl LloydSheriff's Deputy / Jailer (uncredited) | Sheriff's Deputy / Jailer (uncredited) |
| RRoger McGeeRoger (uncredited) | Roger (uncredited) |
| EEdmund MortimerDinner Guest (uncredited) | Dinner Guest (uncredited) |