What's your review of the Arthur episode Baby Kate and the Imaginary Mystery (S11E05)? It is based on the book characters by Marc Brown.
About Arthur S11E05 Baby Kate and the Imaginary Mystery
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Baby Kate and the Imaginary Mystery plot from IMDb: https://www.imdb.com/title/tt0890897/?ref_=tt_ep_nx
Cameron Ansell voices Arthur from season 9 to 11.