Grant Williams as Charles Campbell

Shirley Knight as Terry Ames

Onslow Stevens as Dr. W.L. Janz, M.D.

William Leslie as Dr. David Lindsay

Hope Summers as Mrs. Quimby

Anne Helm as Jean Quimby

Harold Gould as Hollingsworth

Simon Scott as Lt. Kritzman

Michael Bachus as Sgt. Bonner

Harry Holcombe as District Attorney

Jackie Searl as Belmont

Hal Smith as Man Demonstrating Novelty Toys

Ronnie Dapo as Boy Watching Toy Demonstration

Julie Van Zandt as Edna (uncredited)

Tim Rooney as Bobby (uncredited)