Sabrina: The Animated Series (1999)

S1E38 Harvzilla

Harvey is eager to join the wrestling squad, but he lacks the physical prowess of his teammates. To help him out, Sabrina casts a spell that initially gives Harvey impressive muscles. However, things take a wild turn when the enchantment spirals out of control, transforming him into a massive dinosaur. Now, Harvey must navigate the challenges of his new, monstrous form while trying to regain control before the wrestling match begins.