In Gravity Falls, Li'l Gideon seemed to sense that if he won't be able to have Mabel, no person can. Detlef created yet another visual appearance in the third-year finale "Li'l Sebastian", the place Tom and Jean-Ralphio employed him to function for their new leisure business, Entertainment 720. His only job was to shoot basketballs around the business Detlef tried giving them company suggestions, but they disregarded it.