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Wally Veevers is the ex-brother-in-law of Gary Oldknow.
He is a muscular, Caucasian male with black hair and a mustache.
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Scooby-Doo! (DC Comics)
He wanted to get Gary's drive-in movie theater land for development, so he dressed up as Tooma. He got access to the costume because he was a neighbor of Sam V. Arkowitz, taking care of his cat. (Creature Feature)