Scooby-Doo and the Reluctant Werewolf

Every year, all of the classic Hollywood monsters gather at Count Dracula's castle in Transylvania for the "Monster Road Rally", a road race whose winner is given the "Monster of the Year" award by the race's announcer, Dracula's wife and co-host, Vanna Pira. This year however, Dracula receives a postcard from one of the racing monsters, the Wolfman, stating that he has retired to Florida and thus will not be participating in any further races.

Dracula fears he will have to cancel the race due to this sudden, permanent absence, until his lion-like manservant Wolfgang notifies him of a way to create a new werewolf. The full moon will come into the perfect position to transform a human into a werewolf for three nights. The one in line to become the next werewolf is revealed to be none other than Shaggy Rogers, whom coincidentally has won a recent race with the help of his pit crew, Scooby-Doo, his young nephew Scrappy-Doo, and the support of Shaggy's girlfriend Googie.

Dracula sends his hunchbacked henchmen, the Hunch Bunch (named Brunch and Crunch), on a mission to transform Shaggy into a werewolf and bring him back to his castle for the race. The first two nights, the duo is unsuccessful due to Scooby's interference, but on the final night, while Shaggy is at a drive-in movie, the Hunch Bunch successfully transform Shaggy by dropping the sunroof of his car. Shaggy, after alternating between transformation thanks to his hiccups, is trapped in werewolf form, and transported to Transylvania.