Glenn Ford

Character: Prof. Andrew 'Andy' Patterson

Rosemary Forsyth

Character: Vivian Masters Patterson

Dean Jagger

Character: Chad Harmon

Maurice Evans

Character: Harry Masters

Will Geer

Character: Mike Patterson

Eduard Franz

Character: Dr. Konstantin Horvathy

William Conrad

Character: Bart Harris

Robert Pine

Character: Phillip Dunning

William Smithers

Character: Dr. Jerry Fielder

Logan Field

Character: Thaddeus Burns

Dabney Coleman

Character: Agent Shepard

Scott Graham

Character: Weber

James McEachin

Character: Police Detective

Robert Clarke

Character: Dr. Louis Bauier (uncredited)

Lisabeth Hush

Character: Betty Fielder (uncredited)

Mark Roberts

Character: DA Avery Hazelton (uncredited)