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-0 reaching her first. Just as he reaches her, the Time Washing Machine disappears, with Rabbid Peach and Beep-0 in tow.

In an alternate dimension, the Time Washing Machine falls onto an unknown island. During the fall, Rabbid Peach and Beep-0 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-0 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.

While exploring, they come across parts of the Time Washing Machine, only for them to be taken by Collectors. They also face Smugglers that carry some Bad Bananas. After collecting a few parts, Rabbid Cranky leads the team to Rabbid Kong. 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. The gang then head off to find the two keys to reach Rabbid Kong's hideout, which is blocked by a gate. They also learn that the Time Washing Machine was being used to create Bad Bananas, which can power up Rabbids and are the source of Rabbid Kong's new powers.

Each one of the keys is located at a different path, with one of the paths leading to a broken bridge to the Reef. Beep-0 and the trio head to the open path that leadsthem through Banana Lagoon to one of the keys that is attached to Side Eye, a big Rabbid wearing a hammerhead shark skin, who is tricked into fighting them.

After obtaining the first key, the Rabbids, whom they free from the Megabug's control, fix the bridge to the Reef, which allows the four to head to the second key. They soon came across Finn, another big Rabbid that wears a great white shark skin who has the second key as he charges at them.

After obtaining the second key, they unlock the gate and storm into the Jungle to reach the main part and encounter a new enemy, the Summoner. They soon encounter Mega Rabbid Kong and fight him. After destroying the health pool, Rabbid Kong escapes as it explodes and the team falls into the Dungeon.

The trio escape from the Dungeon, only with Rabbid Kong waiting for them for one last battle. The three use a golden Blast Barrel to destroy his hammer as he spits out the Bad Banana he ate to gain his powers, which turns into a normal Banana. Rabbid Peach then convinces him to bring the main part of the Time Washing Machine back to Banana Lagoon to send her and Beep-0 back to Peach's Castle.

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.