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[[Image:Alienguy.jpg|thumb|300px|'''KKDU'''<nowiki>'</nowiki>s true form (left), and his human disguise called Heini (right).]]
'''KKDU''' is a purple alien with wings and tentacles and is the main villain of the comic story "[[Sag niemals Holerö!]]", published in the German ''[[Club Nintendo]]'' magazine. Only near the end of the comic KKDU reveals its true appearance; otherwise he appears in [[human]] disguise as a [[Wikipedia:Schlager|Schlager]] singer called '''Heini''' (pronounced ''HIGH-nee''). KKDU comes from a planet called Ualeh.

KKDU is part of a group of aliens planning to invade Earth. Its command is to turn the planet into a "fast food restaurant". For this reason, KKDU appears in its Heini form on Earth, singing a song called "[[Holerö]]" that turns all humans who listen to it into food. [[Mario]], [[T.T.|TicToc]] and [[Bomberman (character)|Bomberman]] are among the few people who can resist the spell, and soon attempt to stop the evil alien. They are supported by [[Todojewski]] and [[Mahgo]] who explain KKDU's plans to them, but also are fooled by KKDU's allies [[Nicole, Pia and Balu]].

The heroes are finally able to find and defeat the alien in the [[Alte Oper]], [[Frankfurt]]. A concert by Heini is announced there, and Mario and his friends get into the kitchen, where they overhear Heini talking to one of his [[Sickobratz|fellows]]. Heini reveals his true alien appearance, and the transformed humans are served to his alien fellows. However, TicToc and Bomberman use their powers of stopping time and throwing [[Bomb (item)|bombs]], respectively, while Mario and Bomberman evacuate the food people. The bombs explode and the people are saved. However, KKDU manages to escape and takes a spaceship back to his home planet Ualeh, announcing that he will return. Despite this, Heini has not appeared in the ''[[Mario (series)|Mario'' series]] again so far.

==Trivia==
*KKDU's alien form is based on fictional cosmic being [[Wikipedia:Cthulhu|Cthulhu]].
*Heini is named after German folk singer [[Wikipedia:Heino|Heino]].
[[Category:Aliens]]
[[Category:Enemies]]
[[Category:One time villains]]
[[Category:Characters]]
[[Category:Club Nintendo]]