It was a Nintendo Saturday morning cartoon show. It was way rad for the time. Somehow Tetris made it in as a world. Looking on the net, it was called "Captain N: The Game Master".
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Anyway the idea of a Nintendo Kingdom Hearts is pretty cool though I would prefer it if the game was presented as if all of the Nintendo franchises existed in the same world (or galaxy when you take Metroid and Star Fox into it) and no references are made to Nintendo themselves and no indication is made that everyone is a videogame character. There just happens to be places in this world called Hyrule and the Mushroom Kingdom with different races of people living in each and Mario and Link are both people who live in this world who have never met. When you start having stuff like F-Zero World the whole thing seems a lot lamer instead of having Mute City. And no cheesy "kid gets trapped in the Nintendo world" storyline junk either.