In the short, Astro Boy gives his life to save a densely populated space colony from a collision with the sun. The doctor Black Jack saves him, reborn to a new identity as Neo Astro Boy. 
(Source: Anime News Network) 
Note: This short movie was shown as part of the PASONA NATUREVERSE booth at Expo 2025 in Osaka, Japan.

In the distant year 2003, Japan is a technological utopia, and robots are everywhere. One such robot, Tobio, was built by the brilliant Dr. Tenma to replace his dead son. But when it soon becomes apparent that Tobio is an imperfect copy of his departed child, Dr. Tenma throws him out. He is rescued from the scrap heap by the benevolent Professor Ochanomizu, a crusader for robot civil rights. Now the little robot, renamed Astro Boy, is given a mission to defend Japan and the world from all manner of sinister threats. Using his seven super-abilities and 100,000 horsepower worth of strength to battle evil, Astro hopes to set an example to the world of the good which all robots are capable of. 

In the medical profession, there is a name spoken in hushed tones, of an unlicensed genius physician who can save lives&mdash;for a price. His name is Black Jack, and he is a dashing, moody figure, caped in black, a Harlock of medicine, a man who lives by no rules other than his own&mdash;and the Hippocratic Oath. A man who would defy the will of God himself in the name of preserving life. 
(Source: AnimeNfo)

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