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.
Zoran is jealous of her big brother's super-hero status, so she joins Detective Wally Kisagari. They try and solve a strange case involving a bird-like phantom that appears throughout the city.
Astro joins an expedition to the center of the earth, when a member of the crew causes a mutiny. Only Astro can protect the crew and save the expedition before an eruption of lava destroys them all.
Gideon, a dolphin robot is afraid to go into the deep sea because of "The Phantom Pirate," an underwater ghoul. Astro and friends help Gideon overcome his fear before "The Phantom Pirate" strikes.
Astro befriends a spoiled girl named Nina, and a "phantom machine" is being used in a series of Metro City robberies. Astro must solve the mystery and help Nina learn the meaning of real friendship.
Lumanite is a rare and valuable substance recently discovered on the moon. Now, a mysterious shape-shifter is stealing all the lumanite on earth and Astro is called in to investigate.
After being defeated by Astro, Rock is back and looking for revenge--this time he's trying to capture The Firebird, an ultra-advanced space-being who guards the secrets of the universe.
Dr. Tenma builds a powerful and rebellious robot named Atlas, whose abilities rival Astro's. When Atlas begins to destroy Metro City, Astro tries to stop him, and learns secrets from his own past.
An android robot hunter is attacking innocent robots and dismantling them for sale on the black market. Astro befriends the hunter and tries to help him overcome the programming he was given by Skunk.
The battle between robots and humans continues as Astro finds himself caught in the fight between The Blue Knight's rebel robot-force and Drake's anti-robot group.
Klaus is an undercover police robot designed to look like a human. To avoid re-programming, Klaus hides and lives the life of a human being. Can Astro find his friend before the police destroy him?
The evil Skunk tricks Denkou, an "invisible robot," into committing robberies. Astro sees that Denkou isn't bad, she just doesn't know the difference between right and wrong -- and he can teach her.
A GP3 robot is wrongly accused of harming a human girl. Her father orders all GP3 robots be rounded up and dismantled, but The Blue Knight attacks the humans first--triggering the robot revolution.
The Blue Knight establishes a new Robot nation called Robotonia. While human anti-robot forces try to find and destroy Robotonia, Astro is caught in the middle trying to make peace on both sides.
General Red and the human military are preparing to fire the Pulsar Laser Cannon to destroy Robotonia and all of its robots. Astro and The Blue Knight must join forces to foil the attack.
The conflict between humans and robots continues as both sides prepare for a final battle. Astro is close to negotiating a peace settlement, but Drake is determined that all robots be destroyed.
When Astro is damaged during Drake's missile attack, Dr. Tenma must repair him. But Tenma intentionally wipes out all of his memory, and it's up to Zoran to reunite Astro with his family.
After Astro regains his memory and returns home to Dr. O'Shay, Dr. Tenma vows revenge and stages a high-tech attack on the Ministry of Science. Can Astro reason with him in time to save the Ministry?