"Mad, Mad, Mad Monsters" is an animated film released as the third installment of The ABC Saturday Superstar Movie series. It's a prequel of sorts to the 1967 stop-motion film Mad Monster Party?, and was originally released/aired on September 23, 1972.
When Baron Henry von Frankenstein creates a bride for his monster, he decides to make arrangements for a lavish wedding at the Transylvania Astoria Hotel on Friday the 13th. Many monsters are invited, including Count Dracula and his son Boobula, Ron Chanley the Werewolf, the Mummy, Dr. Jekyll, and Mr. Hyde, Claude the Invisible Man and his equally invisible family, and The Creature from the Black Lagoon. However, Dr. Frankenstein's assistant Igor is jealous and wants a bride of his own, so he plots to steal the Bride of Frankenstein, but the plot doesn't go according to plan as the bride gets snatched up by a pterosaur and lands in the clutches of a giant gorilla named Modzoola.