Remembering fond, childhood memories of his trip to Walley World, Rusty Griswold (Ed Helms) surprises his wife (Christina Applegate) and two sons with a cross-country excursion to America's favorite fun park. Following in his father's (Chevy Chase) footsteps, Rusty and the gang pack up the car and hit the road for some much-needed family bonding. Soon, the promise of fun turns into one misadventure after another for the next generation of Griswolds and anyone who encounters them.