The twins must save thier island from an errupting Volcano that they awakened. To do this they must cross into the dark side of the island and find a replacement rudy which is a task imposible to do. Lanny tells the villagers that Brady and Boomer are dead so he can become the next king.

Boomer and Brady find an ancient pocket watch.

When the castle mysteriously explodes, Boomer and Brady are taken to court and forced to relive their most embarrassing and heroic moments through video clips when they try to prove to the jury that they are not guilty of the unlikely event.

Lanny lures the kings into the domain of the Nanju Warrior tribe, which are beautiful young women who have mastered the areas magnetic fields and appear to nearly fly. Unfortunately for Lanny the tribe has high respect for the Kings of Kinkow and it winds up that Brady goes on a date with one of the leaders, Sabrina who is Mikayla's rival from their fight school days. When Mikayla refuses to duel with her Sabrina kidnaps Brady and cages him high in the trees in a trap that is about to fall to his doom unless Mikayla fights. While the two girls battle on land, tree and air, Boomer rescues his brother.

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.

Boomer teaches Boz the fine points of being a brother, but breaks one of the bro-mandments.

When Boomer and Boz tarnish Mikayla’s chance of beating Mason for “Guard of the Year,” they feel guilty and secretly set out to help her by putting themselves in danger.

The Bat Medallion that Boz in Rebecca's apartment has dragged Rebecca to Kinkow. When Mikayla confiscates the Bat Medallion, Kutamungo captures her and the Bat Medallion in order to revive the Tarantula People's leader Kaita the Bat-Rider. The Kings fear of Kaita the Bat-Rider turns into revenge when they discover the evil Kaita is responsible for their father's death.

With Kaita the Bat-Rider at large with his army of undead zombies, Mason and Mikayla use the forcefield to come up with a counter-attack against Kaita's army. Boomer and Boz also have an encounter with the ghost of their parents who encourage them to use their bond to defeat Kaita the Bat-Rider.