Dr. Frankenstein's insane grandson attempts to create horrible monsters in modern day L.A.
| Actor | Role |
|---|---|
 Donald MurphyOliver Frank(enstein) | Oliver Frank(enstein) |
 Sandra KnightTrudy Morton | Trudy Morton |
 John AshleyJohnny Bruder | Johnny Bruder |
 Felix LocherProf. Carter Morton | Prof. Carter Morton |
 Wolfe BarzellElsu | Elsu |
 Harry WilsonThe Monster | The Monster |
 Sally ToddSuzie Lawler | Suzie Lawler |
 Harold Lloyd Jr.Don | Don |
 John ZarembaPolice Lt. Boyle | Police Lt. Boyle |
 Robert DixPolice Det. Bill Dillon | Police Det. Bill Dillon |
| CCharlotte PortneyHysterical Woman | Hysterical Woman |
| VVoltaire PerkinsMr. Rockwell | Mr. Rockwell |
 Bill CoontzLoading Dock Foreman | Loading Dock Foreman |
 George BarrowsLoading Dock Worker Mack | Loading Dock Worker Mack |