Recent thefts of crystal skulls bring Egon Spengler into contact with an old associate, Dr. Edward Carrillion, who owns one of the skulls. But it turns out Carrillion is controlling the ghosts stealing the skulls, in hopes of completing the set and opening a dimensional gate, from which will pour a horde of ghosts under Carrillion’s control. Instead, Carrillion falls into the dimension and faces eternal torment.