Ep. 139: Nobita Uses Doraemon's Beam to Devolve a Mouse and Evolve His Father

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Nobita's father is portrayed as old fashioned. To address this, Nobita utilizes Doraemon's Progression-Regression Beam to alter the timeline. He first applies the device to a mouse, devolving it by 200,000,000 years to transform it into a large dinosaur. He then targets his father, evolving him into a future man. This specific plot was later remade as The Progression-Regression Beam in the 2005 series. The narrative focuses on the experimental use of time-altering technology on living beings to change their physical states and characteristics across vast historical periods.