Performer(s) Appeared in Dr. Finklestein is a character from the 1993 stop-motion film The Nightmare Before Christmas. He is a pale-as-a-sheet mad scientist with a duckbill-like mouth and a hinged skullcap that he can open up to reveal his brain. For unknown reasons, he uses a motorized wheelchair (early drawings of Finklestein depict him standing freely, and his original action figure followed this example, implying he was not always intended to be a wheelchair user). Dr. Finklestein lives in a large observatory with his living rag doll creation Sally and his hunchbacked assistant Igor.