The Crystal King appears at the end of the Crystal Palace, which Mario visits during chapter 7. He gradually appears when Mario approaches him, and declares that he will defeat Mario before attacking.
The Crystal King can levitate, summon Crystal Bits to use as ammunition and shoot freezing beams. In desperation, he can make fake clones of himself and recover his HP; if not beaten quickly enough, the Crystal King will recover 20 HP at least three times, and he and his copies use a blizzard attack. The Crystal King and its copies are indistinguishable.
When Mario defeats him, Crystal King says, "Oh no! The last Star Spirit!! King Bowser, forgive meeeeeeeee!!" before spinning and disappearing in a flurry of sparks.
Like the other bosses, Crystal King appears in the parade at the end during the credits. Two Duplighosts are impersonating him. The real Crystal King removes their disguises and proceeds to berate them until he is carried away by his Crystal Bits, to his surprise.
The Crystal King also makes an appearance in volume 27 of Super Mario-Kun. Before the fight, the Crystal King announces his presence using Ice Bolt by freezing Kooper. The Crystal King borrows his attacks from the original game such as hurling Crystal Bits and creating duplicates of himself. After an assortment of attacks, including Mario's using smelly clothing, Kooper uses a flaming shell to defeat the Crystal King.
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