Dennis Moore

饰：Craig Foster

琳达·斯特灵

Linda Stirling

饰：Sheila Layton

罗伊·巴克罗夫特

Roy Barcroft

饰：The Purple Monster

James Craven

饰：Dr. Cyrus Layton

Bud Geary

饰：Hodge Garrett

Mary Moore

饰：Marcia [Chs. 11-13]

约翰·戴维森

John Davidson

饰：Emperor of Mars [Chs. 2, 10-11]

Joe Whitehead

饰：Carl Stewart

Emmett Vogan

饰：Saunders [Chs. 3-4]

George M. Carleton

饰：Dr. Paul Meredith [Ch. 9]

肯内·邓肯

Kenne Duncan

饰：Charles Mitchell [Chs. 1-2, 10]

Rosemonde James

Rosemonde James

饰：Helen,Maria posing as Helen [Chs. 11-12]

蒙特·黑尔

Monte Hale

饰：Dr. Harvey [Chs. 13-14]

惠顿·钱伯斯

James Wheaton Chambers

饰：Prof. Benjamin [Ch. 11]

Fred Howard

饰：Prof. Crandall (as Frederick Howard)

Anthony Warde

饰：Tony [Ch. 7]

肯·特雷尔

Ken Terrell

饰：Andy Martin [Ch. 8]

Robert Blair

Robert Blair

饰：Police Inspector Evans [Ch. 15] (uncredited)

莱恩·钱德勒

Lane Chandler

饰：Radio Room Technician (uncredited)

乔治·切塞布罗

George Chesebro

饰：Shaw--Chemical plant worker [Chs. 4-5] (uncredited)

约翰·达海姆

John Daheim

饰：Barnes--Gas Tech. [Chs. 14-15] (uncredited)

弗莱德·格兰姆

Fred Graham

饰：Truck Driver Baker [Ch. 3], Henchman Curry [Chs.10, 14],Henchman

凯里·洛夫廷

Carey Loftin

饰：Mack--Annihilator thug [Chs. 5-6] (uncredited)

克利夫·莱昂斯

Cliff Lyons

饰：Clay [Ch. 15] (uncredited)

Lou Marcelle

饰：Narrator,Radio Broadcaster (uncredited)

汤姆·斯蒂尔

Tom Steele

饰：Lab Thug [Ch. 5],Fritz Benham [Ch. 8],Meers [Ch. 13] (uncredited

Dale Van Sickel

饰：Policeman [Chs. 7-8],Ambulance Driver [Ch. 9] (uncredited)

罗伯特·J·威尔克

Robert J. Wilke

饰：Dr. Harvey's Assistant [Ch. 13] (uncredited)

Henry Wills

饰：Osborne,Mason (uncredited)