What mystical character descends in Mario Party 3's storyline?

Mario Party 3’s storyline begins with the descent of the Millennium Star, a mystical star born once every thousand years. The character becomes the central figure in the game’s story and determines who is worthy of becoming the Superstar of the universe.

Mario and his friends witness the Millennium Star’s arrival and argue over who should possess its power. The resulting adventure frames the game’s board competitions as a test of worthiness, with the winner ultimately claiming the title of Superstar. The Millennium Star also replaces Toad as the primary host in the story mode.

Mario Party 3 was released for the Nintendo 64 and is the third main installment in the series. It introduced new boards, characters, and modes while retaining the series’ familiar combination of dice-based movement and minigames. “Millennium Star” is sometimes confused with a generic star character or with the Star Spirits from other Mario stories, but it is the specific mystical figure tied to this game’s plot.