Curious George (2006)

S4E9 The Inside Story

George is under the weather, battling a pesky germ that leaves him sneezing, coughing, and utterly drained. While drifting into a cold-induced slumber, he and Gnocchi embark on a fantastical journey within George's body. Together, they pursue a blues-singing germ named Toots and his backup Germettes, navigating through the monkey's nose, stomach, and lungs in a quest to eliminate the unwelcome intruder and restore George's health.