Scrappy Doo's Life With Mystery Inc Before Seeking His Revenge:
Scrappy Melvin Doo the nephew of Scooby Doo wasn't always evil. He use to join Daphne , Fred, Scooby Doo, Shaggy, and Velma aka Mystery Inc on their mysteries. Scrappy Doo was a very energetic and courageous puppy. He always wanted to be let loose on the culprit by screeching "Let me at 'em!" or shouting from the top of his voice "Puppy Power!"
He too like Velma was very clever by putting the clues together and unmasking the culprit and explained his logic as well as his theory of how he came to his conclusion.
However, those days of working with Mystery Inc was now just a distant memory. He'd been feeling envious of the Mystery Inc as they were always in the spotlight. It was now time for Scrappy Doo to seek his revenge on Mystery Inc.
He did this by luring the Mystery Inc gang to Spooky Island where he made demonic beings enter into the humans bodies sending their souls where they entered into a pool.
Scrappy Doo was ready to take over the world. But Mystery Inc soon put a stop to Scrappy Doo's plan.
After being caught Scrappy Doo was bundled into a cage and was taken via helicopter to the island's prison!
Once in prison Scrappy Doo vowed to one day seek his revenge on his now enemies the Mystery Inc gang who he once was a part of and was loved by the gang. But no more!