The Sea Beast of the Aztecs appears in "Twenty Thousand Screams Under the Sea", an episode of Scooby-Doo and Scrappy-Doo. It was the disguise of Tiger Morris.
The Sea Beast is entirely green. It has a long tail, and spikes on its elbows.
The Sea Beast terrorized a cliff diving competition at Acapulco, Mexico. After Tiger Morris 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.