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One of several Japanese animé series seen on the Fox Network's "Fox Box" Saturday a.m. lineup during the 2002-2003 season, Ultimate Muscle: The Kinnikuman Legacy was a spinoff of the Kinnikuman cartoon weekly that had been running in Japan since 1983. The heroes of the piece were the good-guy members of the Muscle League Champions, an aggregation of wrestlers. Having just met defeat at the hands of their perennial enemies, the dMp, the Champions recruited an alien wrestler named Kid Muscle, the son of a legendary grappler. Not wishing to have the playing field leveled, the dMp dispatched the villainous Addversarious to eliminate Kid Muscle, the better to wipe out the rest of the heroes and take over the Earth. Coming to the rescue was Meat, the trainer of Kid Muscle's father, who endeavored to teach the boy his dad's celebrated "secret moves." First broadcast in Japan in 2001, Ultimate Muscle: The Kinnikuman Legacy made its American TV debut on September 14, 2002.