Boomer and Brady discover Vault 14, a secret vault which protects Kinkow's most mysterious and powerful artifacts including Duplicatus Plantus, a plant that copies anything it touches. The kings make clones of themselves and while they go surfing, they send their doubles to the Kalooki Island Peace Summit. Filling in for the brothers, the clones impress Mikayla, the island dignitaries and the other Kinkowians with their intelligence, hygiene, and professionalism. However, when Brady and Boomer overhear the clones' ultimate plan to takeover, the kings must figure out how to get rid of their doubles and take back their kingdom.