The Monster Road Rally was the race that Shaggy drove in when he was turned into a werewolf by Dracula.
Scooby-Doo and the Reluctant Werewolf
The Monster Road Rally is held annually at Draculas castle in Transylvania. Famous monsters compete for the "Monster of the Year" Award and prizes. When Dracula receives a letter from Wolfy, one of his best racers informing him that he has retired and will not be participating Dracula is afraid he may have to cancel the race. However he soon learns that there is a way to create a new werewolf and the prime candidate is none other than Shaggy Rogers. Dracula sends his two minions "The Hunch Bunch" to transform Shaggy into a werewolf. After they successfully change Shaggy into a canine they drag him to Transylvania along with Scooby, Scrappy and his girlfriend Googie. Once they arrive Shaggy doesn't want to compete but makes a deal with Dracula that if he wins Dracula must turn him back into his normal self. After having his fangs crossed when he made the deal Dracula immediately starts scheming ways to prevent him from winning. He keeps Shaggy from sleeping for most of the night before the race and detunes his car before the race. When Shaggy and Scooby still manage to pull into first place Dracula sends the Hunch Bunch out sabotage them farther. Many of their attempts are thwarted however by Scrappy and Googie who are driving off course keeping an eye on things and contacting Shaggy via radio. During all of this the remaining monsters battle it out on the track in outrageous vehicles. When Googie and Scrappy are trapped with a swamp monster, Scooby and Shaggy rush to save them and even manage to still win the race. However when Shaggy demands to be turned back Dracula refuses, saying that he had his fangs crossed. The group steals Dracula's spell book and makes a run for it, pursued by Dracula in his bat-car and airplane. Narrowly escaping his missiles and Drac-Vac the heroes return home safely. However later that night, unbeknownst to the gang we see Dracula and the Hunch Bunch creep up to Shaggy's window.