Frank Shannon

Dr. Zarkov

Dr. Alexis Zarkov

Dr. Zarkov

Dr. Hans Zarkov (archive footage)

Train Station Gateman (Uncredited)

Prof. Davidson (uncredited)

Professor Davidson

Dr. Hayden

Police Commissioner

Senator (uncredited)

McDowell

Hammond

Mr. O'Malley - Captain of the Nova Scotian (uncredited)

Second Man with California Gold News

Sweeney

Sheriff

Dr. Zarkov

Construction Supervisor at Elevator

Frank, the Bartender (uncredited)

Kelsey (Uncredited)

Inspector McTavish

Captain McTavish

Old Man (uncredited)

Police Capt. McTavish

Police Lieutenant (uncredited)

Police Captain McTavish (uncredited)

Dr. Alexis Zarkov

Mac (uncredited)

Captain McTavish