Scooby Doo Where Are You - Season 1

Scooby-Doo, Where Are You is the first incarnation of the long-running Hanna-Barbera Saturday morning cartoon series Scooby-Doo. In the openning of season 1, while walking home from the movies, Shaggy and Scooby-Doo discover a black suit of armor in a pickup truck, and the gang deliver it to the local museum. The kids later break into the museum to search for clues. What happens next?