Shaggy and Scooby found a lab and found a fridge full of potions. Scooby noticed there are 5 potions in the shape of baby bottles and Shaggy called down Fred, Daphne, and Velma. They came to them and found some potions too. They drank one by one and their clothes got too big and they're now babies and Scooby turned into a little puppy.