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.

After Willie's son (John Luke) leaves Willie's pickup in the driveway with a bone-dry gas tank, Willie and Korie decide that it's time to get the kid his own car. But without a car of his own for the day, Willie is forced to let Uncle Si drive them on their journey to find the perfect vehicle for the teenaged boy. Back on the family land, Jase, Martin, and Godwin make a mess of their fishing trip when a mishap puts Phil's boat at the bottom of the swamp.