Zarko is a stage magician. He appears in "Scared a Lot in Camelot", an episode of The Scooby-Doo Show.
Zarko is a middle-aged Caucasian male with a mustache and goatee. On stage he wore a blue tuxedo with a red bow tie, a black cape, and a black top hat.
Zarko dressed up as the ghost of Merlin to scare people away so he could steal jewels from Shaggy Rogers' uncle, Shagworthy. His henchman dressed as the Black Knight.