As a last resort, Taranza summons the Black Mirror, bringing out Dark Taranza from the depths of the Mirror World. The four Kirby defeat the evil mage who decide to summon King D-Mind to vanquish them. However, the King of Darkness promptly destroys Dark Taranza and challenge the four Kirby in combat.
The four Kirby manage to defeat the king seals him away in the Mirror World before destroying the black mirror. With the mirror destroyed, Taranza comes to his senses, and peace returns to the Dream Kingdom.
King D-Mind's name is a portmanteau of King Dedede and Dark Mind, the two characters upon which this villain is based.
King D-Mind's theme is a remix of both Masked Dedede's and Dark Mind's themes.
Many projectiles from the original Masked Dedede and Shadow Dedede fights are replaced with stars, including the hammer's missiles and the halberd's energy balls. This is a reference to how Dark Mind uses stars as projectiles in Kirby & The Amazing Mirror.
King D-Mind is the only boss to be featured in a "Toughest" ranked level in Team Kirby Clash Deluxe.