Written by Donald Ford, Derek Ford Directed by Robert Hartford-Davis Starring Peter Cushing, Sue Lloyd, Noel Tevarthen, Kate O’Mara US Release Dec. 4, 1968 RT 91 Home Video Grindhouse Releasing (Blu-ray) Classic Horrors rating = 7 (out of 10) Warning: review contains plot spoilers. After a three-hour surgery, Dr. Steve Harris (Noel Trevarthen) tells his…