Jack Frost, Elsa Vinter, Rapunzel Corona and Merida of DunBroch are admitting in a National Sport competition in USA. Each of them has their own specialities. Meanwhile Hiccup Haddock is surveying the safety of the event. Then everything starts to turn out ugly. USA is being infested with the undead who roam the land as they soon find out. Will they team up and form the Big 5? What does it take to survive from this breathtakingly serious situation?