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This is speculation, so of course does not belong in the article — but is it possible that "Mythic Rock" became "Toy Story that Time Forgot"? Thesesources indicate that "Toy Story that Time Forgot" was originally pitched as a six-minute short (so presumably one of the Toy Story Toons). "Mythic Rock" was never formally announced or confirmed by Pixar; somebody just noticed it on a producer's LinkedIn page as a project in development last year. The title "Mythic Rock" could reflect the prehistoric fantasy which seems to be the theme of the "Battlesaurs", the new toys which feature in "Toy Story that Time Forgot".