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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. Pluto interrupts, taking on Harley and throwing him into one of the electronic signs. Astro, Dr. O'Shay, and Zoran are shocked to see what has just happened, along with other numerous spectators and fans. The press is all over it in a heartbeat. Pluto's next targets are Hercules (another very strong robot), Epsilon (robot who predicts and prevents hazardous weather from striking Metro City), and lastly Astro. Determined that he can beat Pluto, Astro tries talking Dr. O'Shay into letting him fight the gargantuan robot. However, Dr. O'Shay refuses, saying that it's way too dangerous. While driving home from work, Dr. O'Shay runs into Dr. Tenma who is standing in the middle of the street. Tenma tells O'Shay that he's sure Astro can beat Pluto because he's his greatest creation. Pluto fights and eventually destroys Hercules. Astro soon arrives by Pluto to try and stop him. Pluto falls because of his earlier wound he got from Hercules, but Astro fixes him and tells him that robots should be friends. The press surrounds Astro's house, while Zoran is unable to go outside without being bombarded. Nora helps Zoran get out. Zoran walks into the woods, where she finds out she's being followed by Pluto. He calls her a friend and makes her a crown made of flowers. Astro quickly shows up, thinking that Pluto is trying to hurt his sister. Zoran tries convincing Astro he's not bad, but can't. Astro and Pluto prepare to face off.