It's all hands on deck for the Duckmen when an old high school nemesis challenges them to a good old fashion race... at the local lawn mower competition. But Willie and the guys soon find out that this competitive and ridiculous underground sport is nothing short of high octane. Meanwhile, Phil has his hands full with his granddaughters when he's called on to construct a playhouse, which he soon uses as an opportunity to teach them about some Robertson family ways.