The Sea Beast of the Aztecs was the disguise of Tiger Morris . He was entirely green, with a long tail. He also had spikes on his elbows. He terrorized a cliff diving competition at Acapulco, Mexico. After Tiger faked his own disappearance, he continued to chase off Mystery-Inc., who attended the contest, as the Sea Beast. He was eventually captured and unmasked.
Sea Beast

Sea Beast of the Aztecs