Johnny Test (2005)

S3E13 Johnnyitis

In a desperate attempt to dodge studying for a test, Johnny consumes an unstable isotope to make himself ill. However, the consequences are far worse than he anticipated. Along with developing red spots and a purple tongue, he learns that if he doesn’t find a cure within four hours, he’ll suffer from severe bloating, uncontrollable coughing, and ultimately face the risk of exploding.