Doraemon (1979)

Doraemon's Health Diagnosis (12x14)

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Something is very wrong with Doraemon, and it's up to Nobita to fix him from the inside. He uses a Small Light to shrink and enters Doraemon. He then meets Mini-Dora who helps him repair Doraemon. Remade as Doraemon is Really Sick? in the 2005 series.