The Diaz family's water park trip turns into a fierce battle as they compete against the Pillman family to win the Aqualympics title.
Harley rallies her siblings and parents to take a trip to Florida to celebrate Christmas with their abuela, but in true Diaz fashion, things go awry. One rerouted flight, an unintended pit stop and a damaged rockstar tour bus later, the Diazes find themselves stranded in a small town without phones, credit cards or money, where they must compete with the town residents in an "Iron Elf" competition to get their bus repaired and make it to Abuela's in time for Christmas.
The Diazes decide to take part in the Iron Elf athletic competition in order to convince a trusted mechanic to fix their broken vehicle.
Harley builds an escape room in an effort to bond with her siblings.