Chandra the Unbelievably Remarkable and Quite Interesting Too is a witch who performs as a stage magician. She was one of the guests at Dracula's Halloween party.
She claimed to have summoned the Ghost of Dr. Van Helsing, but she was actually working with Igor, with a hidden motive to get the Moonstone Medallion, to give her enough magical power to take over the castle. Her plan backfired when she tried to turn Scooby-Doo into a toad. He ran fast enough to lead the spell back to her and transform her instead.
History
The New Scooby-Doo Mysteries
Insert details here. (A Halloween Hassle at Dracula's Castle)