Threshold
Dr. Thomas Vrain
Edgar Fine
Tilla Vrain
Carol Severance
Dr. Aldo Gehring
Henry De Vici
Dr. Cutter
Jay Wingate
David Art
Dr. Basil Rents
Mrs. Anderson
Anita, Vrain's Secretary
Dick Getts
Wanda, Vrain's Scrub Nurse
Mrs. Clure
Tracy Vrain
Larry Hammond