Tonton Streaming The New Scooby and Scrappy-Doo Show (1983) S1E16 - Crazy Carnival Caper

The kids go back to their high school for the Central High Carnival, and run into their old science teacher Mr.McDabble, who has created a ruby lazer that can cut through the hardest metal. But before too long, the ruby ends up missing, and the kids have to find out what happened.