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The Ghost of Terrible Terry Harris was the disguised voice of Susan Stewart on the radio, pretending to be the ghost of a deceased football player.
It was only a voice.
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Scooby-Doo (DC Comics)
At first the gang tried to trace a pirate broadcaster but got nowhere. It turned out Susan was using another room in the same studio to tap into the radio signal. She was the host of a cooking show that got canceled in favor of the sports show. She hoped that driving the sports show off the air would get her old radio time slot back. (The Goal Line Ghost of Terrible Terry)