Grim & Evil — Season 1, Episode 18: Billy's Growth Spurt
Animation, Comedy • 22 min • 5 seasons, 39 episodes • ★ 8.2/10
Episode synopsis
Billy eats too much junk food that makes him feel sick. Grim prepares him a remedy using his granny's recipe, but this medicine makes a parasite to start growing in Billy's back, which Billy names Yap-yap. In the following, Billy and Yap-yap continue eating junk food, so Mandy suggest to use the antidote to the original remedy. Eventually, Yap-yap, now looking like a smaller version of Billy, detaches himself from Billy (which would have technically cured Billy without the need of him drinking the anitdote), and tries to escape from the antidote. In the end, Yap-yap drinks the antidote and is destroyed.
About Grim & Evil
Grim & Evil also known as Maxwell Atoms' Grim & Evil and promotionally referred to as The Grim & Evil Show, is an American animated television series created by Maxwell Atoms. The series, which debuted on Cartoon Network, consisted of two segments which were eventually spun off into their own series, The Grim Adventures of Billy & Mandy and Evil Con Carne.