Gene Barry as Dr. Frank Addison

Lydia Clarke as Martha Addison

Michael Moore as Russ Farley

Nancy Gates as Ellen Haskell

Lee Aaker as Tommy Addison

Milburn Stone as Insp. Harold Mann

Bert Freed as Emil Jablons

Frank Cady as F.B.I. Agent George Weinberg

Houseley Stevenson Jr. as 'Greg' Gregson

Leonard Strong as Donald Clark

Jerry Hausner as John Pattiz

John Damler as Dr. Peter Rassett

George Lynn as Robert Kalnick

Olan Soule as Mortie Fenton

Anthony Warde as Arnie Molter

Tommy Farrell as Baseball Game Usher

Mary Murphy as Young Woman Buying Stamps