Five years ago, a gigantic dragon robot is seen attacking Quest Industries, leaving security guard Radley Crowne’s dog, Reggie, injured. Quest works to save the dog. In the present day, the same robot attacks the gang at City Hall. They’re saved by Blue Falcon and Dynomutt, who have been tracking the robot for years. The two groups team up to stop the robot. They discover that Quest Industries is now owned by Destroido, and that the robot wants the Quest X Power Source, which was used to revive Dynomutt. The robot accidentally takes Scooby as he is wearing Dynomutt’s belt, prompting the team to follow using a tracking device. They arrive on the island, where they defeat Dr. Zin, who wanted the Heart to save his daughter, and save Scooby.
