Creature with the Atom Brain

Richard Denning

Dr. Chet Walker

S. John Launer

Capt. Dave Harris

Michael Granger

Frank Buchanan

Gregory Gaye

Dr. Wilhelm Steigg

Angela Stevens

Joyce Walker

Linda Bennett

Penny Walker

Charles Evans

Chief Camden

Tristram Coffin

Dist. Atty. MacGraw

Pierre Watkin

Mayor Bremer

Harry Lauter

Reporter #1

Larry J. Blake

Reporter #2

Paul Hoffman

Tom Dunn (uncredited)