In an attempt to reconnect with his family, Rusty Griswold takes his wife and sons on a road trip, hoping it will send them journeying through their relationship, but things go unexpectedly odd.
In an attempt to recreate his childhood vacation to his family, Rusty Griswold takes his wife and their two sons on a cross-country road trip to the coolest theme park in America, hoping that this trip will bring them closer together. But events take an unexpected turn.