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The Glasburgh Dragon was a remote-controlled robot operated by Jamison Steven Ripley.
There were two different forms of the dragon. The first had two back legs and wings in place of front legs, similar to a Wyvern. The other had four legs and wings. Both forms were a blackish-purple color and were very large.
Powers and abilities
It could breathe fire and fly.
What's New, Scooby-Doo?
It was discovered that Jamison was using the dragon to help find the treasure of Glasburgh Castle (which turned out to be false). (Large Dragon at Large)