John Cassavetes as Dr. Sam Cordell

John Ireland as Hank Walden

Helen Hughes as Agatha Galen

Kerrie Keane as Laura Kincaid

Erin Noble as Jenny Cordell

Duncan McIntosh as Tim Galen

Harvey Atkin as Joe Prescott

Harry Ditson as Lt. Drivas

Mitch Martin as Mandy Pullman

Matt Birman as Roy Seeley

Beverly Cooper as Pru Keaton

Brian Young as Charlie Prescott

Barbara Franklin as Mrs. Pullman

Neil Dainard as Ernie Barnes

Jennifer Leak as Deena Ferrin

Denise Fergusson as Carolyn Davies

Helene Udy as Sally Harper

Michelle Davros as Jane Barnes

Mary Pirie as Marge (uncredited)

Bruce Dickinson as Samson Lead Singer (uncredited)