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The MegaBug, also referred to as the MegaDragon and later MegaDragonBowser after merging with Bowser, is the main antagonist of the 2017 Nintendo/Ubisoft video game Mario + Rabbids: Kingdom Battle. It is an evil virus accidentally created by the Rabbids and now seeks to erase the Mario and Rabbids universe.


While little is specifically known about the MegaBug, it seems to be the very reason why everything bad is happening, and that whenever the heroes defeat a foe corrupted by its energy, the MegaBug comes closer to its main goal; destroy and consume everything in the world. When it possesses Bowser, Bowser Jr. shows honor and begs the heroes to save his dad.

Every time the heroes defeat a hostile Rabbid, the MegaBug grows slightly, as it absorbs its energy that corrupted the Rabbid in the first place. However, it is required to defeat hostile Rabbids as they endanger the Mushroom Kingdom. It is clear from this that the MegaBug engineered the situation for Mario and company to fail, apparently proving that despite being mute, it is a very clever creature that can engineer situations to its own advantage.

By the time, Mario and his friends recover Spawny from the Lava Pits, the MegaBug has attained enough energy from the Rabbids to manifest a physical form. It grabs Spawny, acquiring his merging ability, and creates a multitude of minions (including Bwario, Bwaluigi, and the Lava Queen) to stall its enemies' progress as it finds a powerful life-force to gain unlimited strength, in this case Bowser.

During its boss battle as MegaDragonBowser, it uses minions to battle on its behalf, but will occasionally launch an attack itself as well, even if it means harming its own minions. However, whenever it spins in it's shell, it becomes defenseless and vulnerable.

After getting defeated, the MegaBug separates from Bowser and makes one last ditch effort to kill the heroes once and for all, but Mario's team fire a series of blasts at the beast, destroying it for good and returning the Mushroom Kingdom back to normal.



As the MegaBug, it is a neon-bright and paper-thin creature with a shiny, long serpent-like body, very bright yellow eyes, a swirly tail, and two large wings that is bigger than the rest of its yellow, red, and orange colored body. Its wingtips are also pixelated.


When Bowser comes home from vacation early, the MegaBug does something to him that leaves him dazed. It then possesses his body to increase its own strength further, which results in the two merging into MegaDragonBowser.

This form retains most of Bowser's normal appearance, but it also applies features of the MegaBug. This includes orange patterns glowing on its body, extremely bright yellow eyes, long curly tail, and large wings that enables it flight. Overall, MegaDragonBowser resembles a demonic Phoenix/Dragon-like version of Bowser.

Powers and Abilities

By itself, the only abilities the MegaBug is shown to have is flight and body possession. However, since it has absorbed much of its energy prior to its confrontation with the heroes, the MegaBug is assumed to be quite strong and powerful in its own right. It managed to daze Bowser long enough to possess him and even after the MegaBug was weakened from its battle as MegaDragonBowser, it was only bought down by a barrage of energy blasts fired by the heroes.

After fusing with Bowser, the MegaBug becomes even more powerful. It obtains (and possibly enchants) all of Bowser abilities, while also keeping its own ability to fly, making it a very dangerous foe.



  • The MegaBug shares a very notable resemblance to the legendary Pokémon Zygarde.
  • The MegaBug's design also shares similarities to Solaris second form.
  • The MegaBug is arguably one of the most serious and evil threats in the Mario series alongside Dimentio and King Boo, but does not have a clear moral agency despite being taken seriously with their heinous actions, while the Shadow Queen never wanted to cause as much destruction as the MegaBug did, as well as merely following her own nature. In addition, neither Dimentio, King Boo, nor the Shadow Queen killed their minions for kicks, at worst brainwashed them.


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Koopa Troop
Bowser | Baby Bowser | Count Koopula | Bowser Jr. | Captain Goomba | Koopalings: (Larry Koopa | Morton Koopa Jr. | Wendy O. Koopa | Iggy Koopa | Roy Koopa | Lemmy Koopa | Ludwig Von Koopa) | Kamek | King Boo | Boom Boom | Pom Pom | Reznor | Burt the Bashful | Salvo the Slime | Roger the Potted Ghost | Koopa Kids | Hoo | Blizzaurus | Army Hammer Bro
Super Mario 64
King Bob-omb | Whomp King | Goomba King
Galaxy armada
King Kaliente | Bugaboom | MegaBug | Peewee Piranha | Topmaniac | Bouldergeist | Dino Piranha | Major Burrows | Prince Pikante | Rollodillo | Glamdozer | Giga Lakitu | Petey Piranha | Gobblegut
Super Mario 3D World
Super Mario Odyssey
Mechawiggler | Broodals: (Topper | Harriet | Spewart | Rango) | Madame Broode | Ruined Dragon | Cookatiel | Torkdrift
Goombas | Boos | Koopa Troopas | Chain Chomps | Hammer Bros. | Shy Guys | Magikoopas | Toadies | Bob-ombs | Piranha Plants | Bloopers | Wigglers

8 Bit Club
Wart | Mouser | Tryclyde | Birdo | Shy Guys

Koopa Troop (Paperverse)
Paper Bowser | Paper Bowser Jr. | Paper Koopalings: (Larry Koopa | Morton Koopa Jr. | Wendy O. Koopa | Iggy Koopa | Roy Koopa | Lemmy Koopa | Ludwig von Koopa) | Paper Kamek | Kammy Koopa | Paper Petey Piranha | Goomba King | Red & Blue Goomba | Koopa Bros | Tutankoopa | Tubba Blubba | General Guy | Lava Piranha | Huff N. Puff | Crystal King
Goombas | Boos | Koopa Troopas | Chain Chomps | Hammer Bros. | Shy Guys | Magikoopas | Bob-ombs | Piranha Plants
The Thousand Year Door
Secret Society of X-Nauts: Sir Grodus | Lord Crump | Shadow Sirens | Doopliss | Shadow Queen
Hooktail | Gloomtail
Super Paper Mario
Count Bleck's Minions: Count Bleck | Nastasia | O'Chunks | Mimi | Dimentio | Mr. L | Brobot
King Croacus | Shadoo | Wracktail | Skellobits: Bonechill | Count Bleck's Father | Francis

Folded Soldiers
King Olly | Handaconda | Paper Macho Soldiers
Legion of Stationery: Colored Pencils | Rubber Band | Hole Punch | Tape | Scissors | Stapler
Other: Lamp Scam Snifit

Smithy Gang
Smithy | Exor | Mack | Bowyer | Yaridovich | Axem Rangers | Blade | Count Down | Domino

Mario & Luigi
Elite Trio
Beanbean Kingdom
Popple | Rookie | Beanies | Mechawful | Sharpea | Troopea | Beanerang Bro | Clumphs | Lakipea

Cackletta and Fawful's faction
Cackletta | Fawful & Dark Star (Midbus, Fawful Express, Fawful Mountain, Super Peach's Castle of Fury, Crawful, Snawful, Chain Chawful, Fawflant, Fawful Guy, Fawfulcopter, Fawflopper, Mawful Mole, Mechawful)
Elder Princess Shroob | Princess Shroob | Sunnycide

Antasma | Belome | Best Fitness Friends | Big Guy the Stilted | Black Jewel | Booster | Chuckolator | Cortez | Count Cannoli | Croco | Culex | Dodo | Donkey Kong | Donkey Kong (Mario VS Donkey Kong) | Draggadon | Foreman Spike | Gooper Blooper | Grouchy Possessor | Grubba | Harsh Possessor | Jojora | Jr. Troopa | Kaptain Skurvy | Kent C. Koopa | King K. Rool | Kritters | Lena | Lucien | Metal Mario | Mario | Mizzter Blizzard | Mollusque-Lancuer | Nabbit | Overset Possessor | Peps | Phantamanta | Portrait Ghosts: (Neville | Chauncey | Bogmire | Biff Atlas | Boolossus | Sir Weston | Vincent Van Gore) | President Koopa | Rabbids: (Phantom of the Bwahpera | Rabbid Kong) | Rawk Hawk | Ricky | Rudy the Clown | Sabasa | Shake King | Shrewd Possessor | Smorg | Squizzard | Tatanga | Three Little Pigheads | Tolstar | Tough Possessor | Tower Power Pokey | Valentina | Viruses | Waluigi | Wario | Watinga | Wingo | Yellow Belly/Helio


Big Bad Wolf | "Crime Wave" Clyde | King Koopa | Robot Princess | Wizardheimer

See Also
Donkey Kong Villains | Luigi's Mansion Villains | Wario Villains