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