The Yowie Yahoo

The Yowie Yahoo was formerly a creature similar in appearance to the Yeti and Bigfoot, until corrupted by Bowser, the resurrected Megatron and Starscream, and WildWind into becoming a monstrous vampire clone of Chernabog to make sure that Wildwind would return triumphantly to the Vampire Rock concert as it's true winners. The Yowie Yahoo was eventually revealed to be a hologram made by Decepticon science, and was shut down for good.