The Chojin Crown
When the Chojin Crown tournament becomes a tournament once more, all Muscle League Fighters must return to thier home countries to fight for a position in the tournament. All fighters return- except Kid Muscle. When Kid overhears Roxanne and her mother talking about how they love guys with bulging muscles fighting in a tournament for honor and the cheers of millions of fans, he runs off to join the Tournament for the Chojin Crown.
Aired 16/10/2002EP 41 - The Chojin Crown
Ultimate Muscle
Kid Muscle (or Mantaro for short) is a bumbling, gross, and wimpy sort-of person. Unfortunately, he has been summoned to protect the earth from the evil dMp, a band of cheating wrestlers from outer space. Luckily he's not undertaking this task alone. Kid Muscle must join the Muscle League, a group of wrestlers from outer space who are training themselves so they can defend the earth, and stop the dMp by achieving "Ultimate Muscle", a hidden power that makes Mantaro an almost unbeatable opponent.
(Source: Anime News Network)