Donkey Kong Adventure

Donkey Kong Adventure is a story expansion for Mario + Rabbids Kingdom Battle, included in Mario + Rabbids Kingdom Battle Gold Edition and available as add-on content that can be purchased from Nintendo eShop for other versions of the game. As its name suggests, it prominently features Donkey Kong. The expansion becomes available when the Top Banana level of the base game has been completed. The expansion follows Donkey Kong, Rabbid Peach, Beep-0, and Rabbid Cranky as they work to defeat Rabbid Kong, who seeks revenge for his defeat in the main game, and has formed an army. It features exclusive enemies, weapons, collectibles, and worlds not available in the main game. Donkey Kong and Rabbid Cranky are also exclusively playable in Donkey Kong Adventure.

Story
The story begins just after the defeat of Rabbid Kong on the block tower of Ancient Gardens. Bowser Jr. and Spawny reach Peach's Castle and find Rabbid Kong at the Time Washing Machine, where some Rabbids are telling him to touch it. He does so, but gets electrocuted and, in a rage, bashes the top of it, causing it to malfunction. Rabbid Kong, as well as some various junk and Rabbids, are sucked into the machine, which stresses Spawny out, causing him to fire a ray from the SupaMerge headset into the machine before the door shuts. Bowser Jr. and Spawny escape just as Mario, Luigi, Rabbid Peach, and Rabbid Luigi arrive. Rabbid Peach goes over to the machine to plug in her cell phone, which is out of battery, all while oblivious to the danger. The others then attempt to get her away, with Beep-O reaching her first. Just as he reaches her, the Time Washing Machine disappears, with Rabbid Peach and Beep-O in tow.

In an alternate dimension, the Time Washing Machine falls onto an unknown island. During the fall, Rabbid Peach and Beep-O are holding on to the machine, but the side of it they are holding gets ripped off from the fall, and the two fly off in another direction, landing on a small area of Banana Lagoon.

There, the two wake up to find themselves on the unknown island. They attempt to talk to some locals, who turn out to be Tropical Ziggies. The Ziggies attack the two, and Beep-O asks Rabbid Peach for assistance, but as she had left her Blasters back at the Castle to roast mushrooms, she can't fight back.

Just as it looks like they are done for, Donkey Kong appears, causing the Ziggies to flee. Alongside him is Rabbid Cranky, an elderly and grouchy Rabbid dressed as Cranky Kong. The three defeat the Ziggies after Rabbid Cranky gives Rabbid Peach a new Blaster, the Megalodon.

After a few battles, Rabbid Cranky led the team to Rabbid Kong, who tries to smash Rabbid Peach. After that, Rabbid Cranky tells them how the main part of the Time Washing Machine ended up at Rabbid Kong's Fort and powered him up. Then the trio went off to find the two keys to get to Rabbid Kong's hideout which was blocked by a gate. They also learn that the Time Washing Machine was being used to create Bad Bananas which could power up Rabbids and the source of Rabbid Kong's new powers

Each one of the keys was at a different path, as one of the paths lead to a broken bridge. The trio went to the open path that led to one of the keys that was attached to Side Eye, a big Rabbid wearing a hammerhead shark skin, who was busy eating Bad Bananas and taunting the Ziggies. When he saw the trio, he was about to escape with his food until two Ziggies convinced him to fight, while they eat his bad bananas,as they double-cross him. Learning this, he soon ran to hide and fight the trio using his mace to throw at them.

After obtaining the first key, the Rabbids, who they free from the Megabug's control, fixed the bridge, which allow the three to get to the second key. They soon came across Finn, another big Rabbid that wears a great white shark skin, who had the second key. He was busy eating until he saw the three fighters and came charging at them.

After obtaining the second key, they unlock the gate and storm into Rabbid Kong's hideout to get to the main part. They soon encounter Rabbid Kong, who tried to impress Rabbid Peach.

Heroes
In Donkey Kong Adventure, only Rabbid Peach, Donkey Kong, and Rabbid Cranky are playable. While Rabbid Peach is only slightly altered from her main game version, Donkey Kong uses almost all new abilities and Rabbid Cranky combines and renames existing abilities.

References to other games

 * Donkey Kong: An area features a Rabbid on a girder throwing barrels at another Rabbid jumping over them, much like Donkey Kong and Mario do in this game, respectively. Beep-0 comments that the jumping Rabbid would "be lucky to get to 125 meters unless he finds a hammer".
 * Donkey Kong 64: An arrangement of the hub world music from this game appears.
 * Donkey Kong Country Returns: Just before the heroes fight Rabbid Kong for the first time, Donkey Kong attacks him like he attacks bosses at the end of boss battles from this game.