Duke's girlfriend
is a guest character in the Goof Troop episode Leader of the Pack. She was a first the girlfriend of Duke and was seen with him at his "turf" Burger Behemoth but after he spots Debbie he ejects his girlfriend out of his car and tries to get Debbie to be with him instead but this plan fails and he ends up getting food thrown at him by his now ex-girlfriend as revenge for dumping her.