By 1977, Muhammad Ali, the most recognizable boxer on the planet, was doing commercials for D-Con, and had dabbled in movies. But a Saturday morning cartoon? A noble idea, but the execution was just off. Here's a sample of I Am The Greatest: The Adventures of Muhammad Ali, uploaded to YouTube:
Independent producer Fred Calvert was responsible for this series, and it would be his last. NBC pulled the plug about halfway through the season, which amounted to, in boxing parlance, a TKO.