“The Black Cauldron,” Disney’s costly 1985 animated flop, is considered by many to be the darkest animated film in the studio’s history (to the point that several sequences were trimmed last minute at the insistence of new exec Jeffrey Katzenberg) but a strong case could be made for 1996’s unfairly overlooked “The Hunchback of Notre Dame” being the most “adult” Disney animated film ever. Based on the beloved novel by Victor Hugo (and inspired, at least in part, by the Lon Chaney film), Disney’s “Hunchback” doesn’t shy away from disturbing material — from the opening sequence that shows the brutal murder of Quasimodo’s mother at the hands of Judge Frollo, to excessive talk of eternal damnation, to a sequence where Frollo, driven mad by his sexual desires for gypsy Esmeralda, pictures her dancing seductively (all of this during a musical number called “Hellfire”). It’s all a little much, but It’s also totally brilliant.