Uncle Willy or, how he prefers people call him, Uncle Adventure is Dave's uncle who visits the Seville House in The Chipmunks episode Uncle Adventure and returns in the episode The Return Of Uncle Adventure.
Adventure, who's now an elderly man, has been Dave's hero since he was a boy. He is a strong and active man for his age, able to carry a large backpack and all three of the boys at the same time. Uncle Adventure has taken part in many journeys, such as being thrown into a volcano and meeting tribes, and is angered when people view him as a fragile senior citizen. He is determined not to let anyone tell him how young he can act as a result of his elderly appearance.