Jumanji: The Animated Series

Peter is tired of feeling left out because he's short. He secretly trades for a serum from Trader Slick that will make him grow. But Peter takes more than enough and doesn't stop growing. He grows so big that Alan and Judy fit in the palm of his hand. Peter is pleased with his size, but he's destroying Jumanji with every stop he takes. The Manjis capture him and are ready to sacrifice him to the Pit of Doom when Alan and Judy bring him an antidote. But now Peter is so small he's in danger of being eaten by a Jumanji shrew.