Marx first appeared as a major character in the Kirby Super Star subgame Milky Way Wishes. In the subgame, Marx asks Kirby to gather the power of surrounding stars to awaken the Galactic Nova so the sun and moon can stop fighting. Once Kirby finds and awakes the Galactic Nova, Marx appears and asks it for the ability to rule Popstar. The Galactic Nova grants Marx's wish, causing him to become larger and grow crystal wings. After Kirby defeats him, Marx is sent flying into the Galactic Nova, causing it to explode.
Marx appears as the final boss in Super Star's subgame The Arena. In addition to these appearances, Marx appears as the final boss in the Kirby Mass Attack subgame Kirby Brawlball, and as a playable character in Kirby Star Allies.
Marx's boss fight starts off with him using the moves that he similarly used against Kirby in Kirby Super Star:
However, Marx has moves neither seen in his original game or from his Soul incarnation in Kirby Super Star Ultra:
Upon death, Marx screams and starts flying around the stage sporadically. His wings break off as he reverts to his smaller form and lands face first on the ground. His body also temporarily alights in a purple flame that simmers out just before the announcer calls game.
In addition to his boss appearance, Marx appears in the game as a spirit in both of his normal and true forms, while his boss theme from Brawl returns as a music track. His hat is available for the Mii Fighters in the shop.
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