A conniving traveling salesman, Plock arrived to the Color Cave. He traded 'Magic Color Crystal Seeds"" to Twink in exchange for the Color Cave. It turned out to be a cave. He was selling tickets to enter the Color Cave. He tore up the contract though, when he realized that if Rainbowland didn't have the cave, the universe would become dark and gloomy. He travels the universe in a mechanical chariot of sorts.
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