When Astro and The Blue Knight try to stop illegal, underground robot fights, they are forced to fight each other. As they prepare for battle, Astro learns the truth about The Blue Knight's past.

With his authority challenged by Shadow, Dr. Tenma sets out to prove that Astro is loyal to the robot cause and will join them in leading the robot revolution.

An underground city threatens the environment, so the environment fights back--tree roots attack the city and its people. Astro must restore the delicate balance of nature to save the humans.

When air-blimp is threatened with a wormhole device, Astro is blamed and arrested. The Blue Knight helps him escape from jail, and together they must save the blimp and prove Astro's innocence.

While saving the planet from a falling satellite, Astro is damaged and loses his memory. Boon, a scientist with a mysterious past, tries to help Astro recover before another satellite hits Earth.

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A micro-robot attacks Zoran's operating system from the inside. Astro must shrink down to microscopic size and go inside of Zoran's system to fight the micro-robot and save his sister.

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A power station orbiting the Earth is set to self-destruct, and Astro partners with the Blue Knight to try to save the robots. They uncover a secret regarding the corrupt humans who caused the danger.

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As Atlas continues his rampage, Astro learns the truth about his own past. With the memory circuits reactivated, Astro remembers being created, rejected, abandoned by Dr. Tenma, Astro must face difficult questions about his own identity and his ultimate destiny.

Pluto vows to become the supreme robot champion of the world. As he defeats his rivals, he gains their special powers and becomes even stronger. Astro is the only one left who can stop Pluto.

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On Deimos, one of the two moons of Mars, robot miners ignore the orders of their human foreman and mysteriously begin digging on their own. Astro must work fast to discover the cause of the robots' strange behavior before Intergalactic Security exterminates them for disobeying.

When Kato hides a hyper-accelerator virus on the robotic super train Neon Express, it sends the train and its passengers speeding out of control. Astro must rescue the passengers and prevent the train from crashing into the center of Metro City.

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