When Dr. Tenma creates a little sister named Zoran for Astro she gets loose and goes out into the city. After making friends with a bird, she finds out what is happening to all of the other birds, and is kidnapped. It is up to Astro Boy to save her and destroy the robot.moreless
Astro and Dr. O'Shay take a visit down to Deep City, designed by Professor Sebastian. It's an underground city where anything and everything goes on, along with nature. Hannah, the tour guide, show Astro, Dr. O'Shay, and Sebastian the sights in Deep City, accompanied by Mayor Manny.
An old government war satellite is about to crash back to Earth. It is equip with an nuclear warhead that could destroy a city and it's heading for Antarctica. The explosion could cause the polar ice caps to melt which would flood the Earth.
When the land around Dragon Lake is poisoned and begins to die, Astro must find the source of the poison. When he gets there, he meets the eccentric explorer, Gulliver, and they face off against the toxic Repo Girls in a fight to save Dragon Lake.
Zoran gets in the middle of Astro and Pluto's shoot-out, causing her to get hurt. Pluto runs away, promising the next time they meet, it will destroy Astro.
Dr. Tenma builds his latest strongest robot to date, Pluto. He builds him to destroy all other robots. Pluto's first target ends up at the Rocket Ball Arena, where Harley and his teammates are in the middle of an exciting game.
Robot hunters are running loose in Metro City as they deactivate and steal any robot they wish. A new robot police squad is issued, with leader Delta, and their first assignment is to find and capture these hunters.
Skunk tries escaping from prison and almost succeeds until the police finally capture him again. They put him in an even more disclosed area and have tighter security so that he'll have absolutely no chance to escape.
Under the control of Dr. Temna, abandoned robots used to cool down Venus arise from deep sea to give 'salute' to the Captain, which will freeze Metro City. Can Astro save the city in time, without putting the city into an ice age?
A young girl named Mimi runs into the Ministry of Science asking for help from Astro. She explains that earthquakes and other natural phenomenons are destroying her farm in Rainbow Canyon.
The evil skunk tricks Denkou, an "invisible robot," into committing a string of robberies. Astro soon realizes that Denkou isn't bad, she just doesn't know the difference between right and wrong -- and Astro is the only one who can teach her.
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.
As Atlas continues his rampage, Astro learns the truth about his own past. With his memory circuits reactivated, Astro remembers being created, rejected, and abandoned by Dr. Tenma. Astro must now face difficult questions about his own identity and his ultimate destiny.
When a friendly robot-dog invites Astro to watch a game of Rocket ball,he looks forward to a fun day at the ballpark instead,the game turns chaotic when the robot players start destroying the stadium and threatening the human spectators. Astro must find a way to save the humans and get the robot athletes back under control!moreless
Dr.O'Shay activates Astro by drawing all of the city's power and using it to jolt Astro to life.But The Power Surge overloads the Metro City Power System.Turning Magnamite,the power-controller,into a robotic menace.When Magnamite comes crashing across the city like a huge mechanical octopus,Astro must quickly master his amazing powers in order to save the city from the rampaging robot.moreless