Fifteen-year-old Ben Tennyson must utilize the Omnitrix yet again in order to locate his missing Grandpa Max, accompanied by his cousin Gwen and former enemy Kevin 11.

In a war-torn world of elemental powers, a young boy reawakens to undertake a dangerous mystic quest to fulfill his destiny as the Avatar, and bring peace to the world.

The Mystery Gang goes to Hawaii for the Big Kahuna of Hanahuna Surfing Contest. However, the gang and the locals find the island invaded by the vengeful Wiki Tiki spirit and his demons.