Tom Kennedy
— Tom
Monte Collins
— Monte
Phyllis Crane
— Miss Millstone (uncredited)
Val Duran
— Dr. Wong (uncredited)
Eddie Lee
— Chinese Henchman (uncredited)
James B. Leong
— Chinese Man (uncredited)
Jack 'Tiny' Lipson
— The Monster (uncredited)
Wilfred Lucas
— Professor Edwin Millstone (uncredited)
Sam Lufkin
— Cop (uncredited)
Harry Semels
— Dr. Wong (uncredited)
Blackie Whiteford
— 1st Bank Robber (uncredited)
Beal Wong
— Chinese Henchman (uncredited)