The New Scooby and Scrappy-Doo Show

Season 1, Episode 16

Episode Title: Crazy Carnival Caper

Air Date: 1983-10-15

Overview:

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.