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Harry Arm is a character on The Magic School Bus. It was mentioned in 'In The Arctic' that he was in Ms. Frizzle's class 'last year.' He is first seen in the episode 'In The Arctic.' He also appears in 'Works Out' when he gets a job as the announcer for the Teacherathalon. He was voiced by Arnold's season 1 voice actor Amos Crawley.

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