watch 01:48 The Loop (TV) Do you like this video? Uncle John is a relative of Arthur. He missed out on Theo's 85th birthday since he is in the military and stationed overseas. He is only mentioned in "The Rhythm and Roots of Arthur." Retrieved from "https://arthur.fandom.com/wiki/Uncle_John?oldid=412348" Categories: Male Aardvarks Read family Mentioned characters Military personnel A to Z Unseen Characters Community content is available under CC-BY-SA unless otherwise noted.