Doraemon (1979)

Development and Degradation Radiation (1x139)

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Nobita's father is old fashioned, so Nobita uses Doraemon's Progression-Regression Beam to make things as they would have been in the past or future, then starts on living things with a mouse devolved 200,000,000 years to become a large dinosaur and his father evolved into a future man. Remade as The Progression-Regression Beam in the 2005 series.