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In page The Wonderful World of the Brothers Grimm:

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Pal signed an agreement with MGM to finance Galaxy's slate, the first film produced being tom thumb (1958), based on a Grimm fairytale. In 1957 Pal announce he wanted Grimm to follow tom thumb with Alan Young and Eddie Bracken in the leading roles.[3] In April 1958 he signed Mary Brown to do the costumes.[4]