Guest Stars Jessica Walter as Margaret Nicholson Lee Montgomery as Steve Spelberg Robert Walker, Jr. as Neil Cahill José Ferrer as Dr. Marshall Cahill Lew Ayres as Dr. Howard Nicholson Co Starring Deidre Hall as Receptionist William Christopher as Male Scientist Luis Moreno as Officer Lou Wagner as Ross William Bryant as Fields Bert Holland as Whitehead John Zaremba as Coroner Charles Macaulay as Farnsworth Darrell Zwerling as Motel Manager Dianne Turley Travis as Lady Scientist Dennis Robertson as 1st Reporter Arthur Batanides as Murph Jefferson Kibbee as Jeff Ed Fury as Plainclothesman