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.
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.
Boomer goes to Chicago in an effort to convince Rebecca's father to let him see her after he forbids them to be together. Boz tags along and searches for a safe place to hide the Bat Medallion. Meanwhile, a menace from the past launches a surprise attack on the kings and it is revealed that Rebecca's father used to be part of the Tarantula tribe. As a result, he erases Rebecca's memory of her relationship with Boomer to keep her safe.
Boomer, Boz, Mikayla, Mason, and Lanny watch Candace's show revealing the mysteries of Kinkow, causing Boz to have doubts about being Co-King. When a temple is discovered belonging to an ancient evil named Kaita the Bat Rider (whose mummy is in the possession of the Tarantula People), Candace is trapped inside and the entrance is sealed by a force field that only the Kings can get through.
When Boomer discovers that he and Boz do not have any brotherly memories like he and Brady do, he sets out to recreate a ski-trip from his childhood. But, when Boomer finds that the land he wants to build his resort on is occupied by Yetis, he removes them from the land and attempts to teach them how to be civilized.
Boomer fears that Mikayla and Boz's budding friendship will blossom into a crush and he'll lose another brother to a Mikayla preoccupation. He gives Boz and Mikayla a Dirt Fairy potion so they'll dislike each other, but the potion is too potent and sends them into mortal combat instead.
When Boz sets out to help Boomer make his childhood dream of becoming a professional athlete come true, Boomer believes he's a natural at the dangerous island sport of Thumb War. With a chance to become a pro thumb warrior, Boomer wagers the castle and loses, only to find he's been conned by a Dark Side crook.
The kings are transformed into unrecognizable versions of themselves after they fall under a spell, and must dance with the fairest girls in the village to reverse their condition.
Boz's monkey antics ruin a double date.
Boz decides to address Boomer's lack of survival skills and forces him to go camping.
Boz and Boomer become stuck together after Boz wishes they were closer.
When Mason thinks Boomer's club is too rowdy, he takes over as head bouncer, but starts to keep the party out. In order to get Mason away from the club, the Kings lead him on a wild goose chase, leaving the club wide open and vulnerable to a mythical human-like sponge creature named Damone (played by WWE's "The Miz"), who absorbs everyone's confidence.
Boomer, jealous of the attention Boz is getting, enters the Jikki Kiki dance contest, and picks Boz as the second dancer, believing it an easy win, but when Boomer discovers that Boz is a great dancer, a rivalry develops between the two.
When one of the Kings' stunts gets Mikayla suspended, she calls them horrible bosses and quits her job to work at a fast food restaurant.
A kid from Boz’s past arrives with a devastating secret that could ruin Boz’s reputation.
Boz tries to impress his ex-girlfriend with a charade of wealth. She doesn't actually care about Boz and is only there to take his made up riches.
When Boomer and Boz find out Lanny is mad at them, they buy him his own island. But when they learn that the source of their wealth lives on that island, a gopher that produces gold, they try to get the gopher back without Lanny finding out.
A kid from Boz’s past arrives with a devastating secret that could ruin Boz’s reputation.
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.
Boz defies Boomer's warning and goes to the Dark Side. He finds a baby and brings it home, causing the Tarantula People to threaten war because it was their baby prince.
Boomer teaches Boz the fine points of being a brother, but breaks one of the bro-mandments.
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.
