Prof. Steigg

Gregory Gay

Dr. Chet Walker

Richard Denning

Joyce Walker

Angela Stevens

Capt. Dave Harris

S. John Launer

Frank Buchanan

Michael Granger

Dr. Wilhelm Steigg

Gregory Gaye

Penny Walker

Linda Bennett

District Attorney MacGraw

Tristram Coffin

Chief Camden

Charles Evans

Reporter #1

Harry Lauter

Mayor Bremer

Pierre Watkin

Reporter 2

Larry Blake

Gen. Saunders (uncredited)

Lane Chandler

Tom Dunn (uncredited)

Paul Hoffman

Dr. Kenneth C. Norton (uncredited)

Nelson Leigh

Jason Franchot (uncredited)

Edward Coch

Lester Banning

Don Harvey

Willard Pearce

Karl Davis

Dick Cutting, Radio Broadcaster (uncredited)

Richard H. Cutting

Gambling Casino Employee (uncredited)

Paul Bradley

Tom, Policeman (uncredited)

Terry Frost

Creature (uncredited)

Charles Horvath

Policeman (uncredited)

Cap Somers

Police Officer (uncredited)

Tyler McVey

Bartender (uncredited)

Eddie Foster

Policeman (uncredited)

Bill Clark

Pilot (uncredited)

Chuck Hicks

Creature Who Calls Camden (uncredited)

Dick Crockett

Creature (uncredited)

George Bruggeman

Creature (uncredited)

Boyd 'Red' Morgan

Creature Vernon Dunn (uncredited)

Michael Ross