What's your review of the Arthur episode Mr. Ratburn's Secret Identity (S19E09)? It is based on the book characters by Marc Brown.
About Arthur S19E09 Mr. Ratburn's Secret Identity
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Mr. Ratburn's Secret Identity plot from IMDb: https://www.imdb.com/title/tt4677664/?ref_=tt_ep_nx
William Healy voices Arthur from season 18 to 19.