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Monty Caswell is a reality TV star of GSI: Ghost Scene Investigators, which features a group of paranormal investigators, much like Mystery Inc.—they're actually inspired by them. He is the equivalent to Shaggy Rogers.
Monty is an African American male, with thick, black hair. He wears a white shirt, with a black tie, pants, and shoes.
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Scooby-Doo! Who's Watching Who?
Soon enough Mace Middlemost, the show's manager, had Mystery Inc. on the show competing against GSI. He had a hard time getting along with the Scooby gang, just as his colleagues did toward their own counterparts. After the mystery in Ocean Land, he warmed up to Shaggy, but got mad when Mace replaced GSI with the Scooby gang, saying, "[They] may forgive man, but [they] don't forget." He and his colleagues returned for the final mystery at Wolf's End Lodge. They were even suspected of being the Ghost Hunter Haunter, but it turned out to be their own manager.