Scrappy-Doo

Scrappy-Doo is the main antagonist of the film Scooby-Doo. He is Scooby's spoiled nephew who turned evil due to Mystery, Inc. dropping him from the gang for being a nuisance, peeing on Daphne and demanding to become the new leader.

He is voiced by Scott Innes.

Scooby-Doo
During a flashback recalled by Velma Dinkley at one point in the film, Scrappy is first seen harassing the gang in the Mystery Machine, bragging about how he will fight ghosts and monsters. Fred Jones tells him he has told him before ghosts don't exist (referencing the fact that the versions of the show Scrappy is in by portraying real supernatural creatures as commonplace). Scrappy argues that ghosts do exist and when he finds them, he'll give them a dose of his "puppy power" and he then urinates on Daphne Blake, giving a long hot stream of yellow pee on her as he sighs with relief, demonstrating his puppy power. When Scrappy realizes this, he gasps in shock and Fred immediately stops the Mystery Machine, sending Scrappy flying into the windscreen.

As he slides off, Fred scolds him for urinating on Daphne. After fixing himself, Scrappy crosses his arms and irritably insists it was an accident, but Fred calls his bluff and tells him he was marking his territory. Now realizing that Fred likes Daphne since he is the leader, Scrappy angrily tells him he isn't worthy of being the team leader. He orders the gang to listen and announces it is time to appoint him as their "unquestioned" leader or else he'll leave. Scrappy is then unceremoniously thrown out of the van in the middle of the desert along with his suitcase, with no one giving a second thought.

The puppy hollers out to them they can't do that since people adore him (which is not exactly true). He then kicks his suitcase in anger and frustration, knocking it over and hurting his foot. Scrappy says he's as cute as "a Powerpuff Girl" and that he'll get his own TV show as he sits on his suitcase, alone and friendless.

Several years later, Scrappy built a mechanical version of Emile Mondavarious, the owner of Spooky Island, abducting him so that he could use the robot to impersonate him. He had teamed up with an insane man named N' Goo Tuana and his evil cohort Zarkos. Scrappy and his allies created an army of monstrous demons through voodoo, but the monsters die when exposed to sunlight, so they possessed humans to become immune to sunlight while the souls of the people were converted into protoplasm and kept in the cave beneath the island. By absorbing the souls, Scrappy is able to become a powerful monster known as Scrappy Rex.

He only needed Scooby-Doo's protoplasm (a "pure soul") to complete his transformation and become unstoppable (probably because he and Scooby are related). He then chased Scooby and Shaggy Rogers until he had them cornered. He then managed to catch Scooby after Mary Jane hands him over. Scrappy taunts Scooby by dangling him in the air and commenting how small he is, Scooby retaliates by sticking his hands up Scrappy's nose and pulling his boogers. Scrappy yelps and flings him out but then sneezes on Scooby. Scooby tells Scrappy to sit down and punches his nose, making Scrappy roar angrily in his face and take him over to the Pinscher to extract his protoplasm. But Zarkos falls over the vat after his fight with Daphne (who pushed him in), releasing the people's protoplasm. Enraged, Scrappy tells the Mystery, Inc. gang their fight isn't over and he'll still kill them, but Shaggy gets Scrappy's attention by calling him a bad puppy and he finally defeats Scrappy Rex by pulling the Daemon Ritus out of his chest and destroying it. While screaming in terror and horror, he loses all of his protoplasm and then morphs back into Scrappy-Doo. Scrappy faces his uncle, telling him he can still take him and he challenges him to a rematch, but Scooby easily whacks Scrappy into a wall. In response, Scrappy says, "Is that all you got?" and Scooby shrugs.

Scrappy and his henchmen are then taken to prison when the police helicopters arrived on the scene, with Scrappy being taken away in a dog cage. His last words to the gang are, "And I would have gotten away with it, too! If not for you meddling sons of--", only to be cut off by a police officer shutting the door as the puppy continues to rant and rave. The gang are in shock over Scrappy almost saying the bad word (also wondering where he heard it), but the subject is immediately changed with the news people talking to the gang again.

It's currently unknown what happened to Scrappy and his henchmen in the end, but they most likely remained in prison for life.