Compilation of Episodes 1,2 46, 56 and 71 from the 1963 Astro Boy series that were reproduced in color for this theater version.

Nuclear testing has resulted in the abrupt evolution of the Fumoon, a tiny but highly intelligent humanoid race on a small island, who are detected by Dr. Yamadano. Except for a few witnesses including the detective Shinsaku Ban, and the young men Rock and Kenichi and Kenichi’s sister Pichi (Pinoko), no one believes him. The Fumoon are kidnapping animals from around the world to bring with them as they use their space ships to evacuate the earth, because they know Earth is shortly to be destroyed by an enveloping cloud of black gas created by a stellar explosion. The Fumoon intend to abandon mankind, but one Fumoon, Rokoko, who becomes good friends with Kenichi, tries to help Dr. Yamadano and the others to develop a space ship to allow a few humans to escape, with the help of Dr. Ochanomizu and Dr. Frankenstein.

Phoenix 2772 starts with twelve minutes without dialogue, much like a silent film, recalling the birth and education of Godo. In this brave new world, children are born in test tubes and are raised by computers and robots. Godo learns the skills that will make him into a great pilot, assisted by the robotic wonder Olga. Everything that Godo needs is provided for him until he eventually goes for training with his automaton companion. He soon realizes that the world is not what he expected...