The Zebra Monster was the alias of an unnamed criminal hired by Preston Pressman.
He looked like a humanoid zebra.
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Scooby-Doo! (DC Comics)
The Zebra Monster appeared the week Holly Heartworm was a guest star with the gang. Heartworm was useless but she got all the publicity, just as Pressman planned. The hired criminal provided a safe case for the actor to star in. (Guest Stars!)