In Gravity Falls, Li'l Gideon appeared to feel that if he cannot have Mabel, no one can. Detlef created yet another physical appearance in the third-year finale "Li'l Sebastian", where Tom and Jean-Ralphio hired him to do the job for their new leisure organization, Entertainment 720. His only position was to shoot basketballs all around the business Detlef tried using offering them organization advice, but they disregarded it.