Collin Dean is the voice of Gregory. Over the Garden Wall was not the first Cartoon Network show Dean appeared in as he starred in the Adventure Time episode, "One Last Job," in which he played Tiffany, a member of Jake the Dog's old gang. He was also an announcer for Cartoon Network's sister channel Boomerang as well as the voice of Lincoln Loud from Nickelodeon's The Loud House.
We're Getting Mutants in the MCU - The Loop
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