Julia Cotton is Kirsty's Wicked Stepmother who, while she seems regretful at feeding other men to Frank and refuses to kill her husband, she later shows no problem with doing either, and helps kill her husband so Frank can wear his skin. She is also perfectly willing to let Frank rape her own stepdaughter, Kirsty. After she is revived in the second film, shedding any possible redeeming qualities she had along the way, she gleefully drains people at a mental hospital of their life while relishing in their pain and suffering to restore herself. She feeds her rescuer Dr. Channard to her master to turn him into a Cenobite, and tries to kill her stepdaughter and an innocent, mentally handicapped girl as well. When she encounters Frank again, she shows no hesitation in brutally murdering him, showing she's cast off any human attachment.
Dr. Phillip Channard is a psychiatrist and head of the Channard Institute with an obsession with the occult, specifically Hell. Using his facility for the as front for his studies, he has his patients solve the Lament Configuration, and observes them being taken by the Cenobites. When he gets his hands on the mattress Julia Cotton died on, Channard takes his patients to be sacrificed to complete Julia's resurrection. In return, Julia takes Channard to Hell where Leviathan looks into his mind, revealing that he would dissect animals as a child. Channard is turned into an abnormally chaotic cenobite, he drops his affable façade and revels in his sadistic one, proceeding to slaughter every living thing that crosses his path, also killing the other Cenobites when they stand against him. It's also discovered that Hell is beginning to crossover with Earth due to Channard giving his patients their own puzzle boxes.
Ensemble Darkhorse: This is the film where Pinhead stakes his claim as the franchises main baddie. Overshadowing the intended Big Bad of the franchise, Julia. Who is never seen again this film.
Fridge Horror: When Cenobites die, they revert back to their human, pre-Cenobite form. When the Chatterer dies, he turns into a teenage boy. What kind of twisted desires could a boy so young possibly have to become that?
Nightmare Retardant: The Channard Cenobite, as his presentation has more common with the oneliner-spouting boogeymen of the eighties ("The doctor is in", "I recommend amputation!" etc.) than the dark twisted S/M demons that are the Cenobites. Not to mention his phallic head.