The Underwater City

William Lundigan

Bob Gage

Julie Adams

Dr. Monica Powers

Roy Roberts

Tim Graham

Carl Benton Reid

Dr. Junius Halstead

Chet Douglas

Chuck Marlow

Paul Dubov

George Burnett

Karen Norris

Phyllis Gatewood

Kathie Browne

Dotty Steele

Edward Mallory

Lt. Wally Steele

Edmund Cobb

Meade (uncredited)

George DeNormand

Dr. Carl Wendt (uncredited)

Paul Power

Author in Visiting Party (uncredited)