Tonton Streaming Heathcliff and the Catillac Cats (1984) S1E22 - Monstro vs. the Wolf Hound

Riff Raff and the cats watch a horror movie, and that night Riff Raff dreams he is Dr. Frankencat and has created a monster. It's a regular nightmare, with even Leroy showing up as the Wolfman. Riff Raff wakes up screaming for help, and glad it was all a dream.