Roy Barcroft

The Purple Monster

Dennis Moore

Craig Foster

Linda Stirling

Sheila Layton

James Craven

Dr. Cyrus Layton

Bud Geary

Hodge Garrett

Mary Moore

Marcia

John Davidson

Emperor of Mars

Joe Whitehead

Carl Stewart

Emmett Vogan

Saunders

George M. Carleton

Dr. Paul Meredith

Kenne Duncan

Charles Mitchell

Rosemonde James

Helen

Monte Hale

Dr. Harvey

Spencer Gordon Bennet

Fred C. Brannon