What's your review of the Arthur episode D.W. and Dr. Whosit (S23E02)? It is based on the book characters by Marc Brown.
About Arthur S23E02 D.W. and Dr. Whosit
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D.W. and Dr. Whosit plot from IMDb: https://www.imdb.com/title/tt12222598/?ref_=tt_ep_nx
Roman Lutterotti voices Arthur from season 22 to 25.