While trying to prove that they are the Kings of Legend, Boomer and Brady accidentally bring Zadoc, an ancient evil statue, to life, consequently putting the entire island in extreme danger. The twins cede the throne to Lanny for the better of Kinkow and depart on a balloon voyage back to Chicago for good, until the balloon catches a wind and sends them plummeting straight to the Dark Side of the island.

Zadoc's minions capture Lanny and try to squish him with a huge rock. Lanny hands the throne back to Boomer and Brady. Mason goes after Zadoc and sees Boomer and Brady fight and defeat Zadoc and realizes that maybe they are the kings of legend.

Bad weather stops King Boomer from joining King Brady as he leaves the island for good. A long-lost brother, raised by apes appears keeping it a pair of kings.