Tumbrell Doozer appears in the fifth season Fraggle Rock episode "The Trial of Cotterpin Doozer". Tumbrell is jealous of Cotterpin Doozer's status as The Architect's apprentice. He spies on her conversation with Red Fraggle, and sets into motion Cotterpin's trial, accusing her of befriending Fraggles. However, when it is proven that there is nothing wrong with befriending Fraggles, he still complains that Fraggles look ugly.