Before winning, Miley Cyrus receives a super greeting on the orange carpet at the 21st Annual Kids' Choice Awards.

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Squeezed into a fluorescent green superhero suit, Jack Black opened Nickelodeon's 21st Annual Kids' Choice Awards by singing a wacky ode to the wonders of slime, playing the bongos and finishing off with a swift karate chop that demolished a stack of cinder blocks.

"Welcome to the slimiest, starriest, 'choiciest' awards show -- ever!" Black yelled to an auditorium filled with screaming children.

Yes, welcome to the kiddie Oscars, where Nickelodeon viewers vote for their favorite winners and the Slime Meter tallies the madness of the evening. This year, in fact, 88 million votes were clocked on the Nickelodeon website, Black announced.