The theater was a location where a puppet show was playing.
History[]
Scooby-Doo! Mystery Cases[]
The cowardly gluttons encountered a ghost in the backstage area of the theater while searching for Scooby's costume to wear on his big debut.
After some running around and hiding, they caught the ghost out of dumb luck and revealed it to be famous actress, Gloria Gertrude. Who was trying to scare Scooby and Shaggy away so she could have the lead role.