Donald Murphy

Oliver Frank(enstein)

Sandra Knight

Trudy Morton

John Ashley

Johnny Bruder

Felix Locher

Prof. Carter Morton

Wolfe Barzell

Elsu

Harry Wilson

The Monster

Sally Todd

Suzie Lawler

Harold Lloyd Jr.

Don

John Zaremba

Police Lt. Boyle

Robert Dix

Police Det. Bill Dillon

Charlotte Portney

Hysterical Woman

Voltaire Perkins

Mr. Rockwell