Robert Culp as Steve Brannigan

Martin Milner as Paul Burke

Barbara Hershey as Mary Cutler

Richard Basehart as John Cutler

Carol Lynley as Abbie Adams

Roddy McDowall as Mr. Franklin

Cameron Mitchell as Sam Adams

Eric Olson as Andy Cutler

Teresa Wright as Alice Cutler

Francine York as Daisy Kempel

Whit Bissell as Dr. Ted Horne

Leif Garrett as Johnny Lowman

Ann Doran as Emma Fisher

Elizabeth Rogers as Nancy Lowman

James Griffith as Charlie Davis

Edna Helton as Mrs. Wilson

Gloria Stuart as Mrs. Parker

Jack Collins as Jack Spangler