The Greatest Robot in the World

The Greatest Robot in the World is the name of two episodes in the '80s series. It featured a remake in the '03 series and was the basis of the Pluto manga. this is the first anime to have a character to Crossdress.

Plot
A Sultan wants to be the ruler of the world, so he got an masked human scientist to help him create a robot with 200,000 horsepower. The robot, named Bruton, was then set to defeat the strongest robots in the world one by one, including Astro.

His first target is a Swiss mountain robot named Mont-Blanc, which was an easy target because he did not suspect the attack. Afterwards, Bruton went to find Astro.

Astro was not at home, plus Professor Ochanomizu told Astro not to fight. Uran then pretends to be Astro, seeing to be no match and does not possess his powers, Bruton concludes that she is Astro's sister and holds her captive.

Bruton goes to fight Monar a fearsome butler robot, but again is easily overcome. Seeking Astro, he and Astro meet somewhere, however its the residence of the next robot, Brando, which Bruton overcomes, this time with difficulty. During the fight Bruton is severely injured, and begs Astro to push a button on his chest in order for him to live. Astro agrees. His masters come and collects Bruton and plants a suicide bomb in his chest; should someone defeat him, that someone would also be destroyed. Now for the next target: the great German robot  detective Gerhardt. Gerhardt is made from a special material, however Bruton eventually defeats him also.

Ochamizu finds Bruton's hideout, however they held him captive in a underground vault, and he would only be released if Astro fights Bruton. Astro and Bruton fight, however Astro is almost beaten when Bruton lets him go, since Astro saved his life once Bruton saves him - but only once.

Bruton goes to find Hercules, a Greek noble robot. He is soon destroyed.

The next target is Photar, a robot from the Southern Continent. Photar uses the sun as his power, but because of the weather there is little sunlight. His soft spot for children determines his fate.

Astro and Bruton then fight on the mountain of tears. During the fight, the volcano eruptes, and Astro attempts to cover the crater with rock. Bruton, after watching for a while, then helps him and the danger is stopped.

2003 series remake
The 2003 series remake has two episodes, The Rise of Pluto and The Fall of Acheron, and many of the more important characters either return or are replaced:
 * Bruton = Pluto
 * Mont-Blanc = N/A
 * Monar = N/A
 * Brando = N/A
 * Gerhardt = N/A
 * N/A = Harley
 * Hercules = Hercules
 * Photar = Epsilon
 * Bora = Acheron

Pluto (manga)
A manga by Naoki Urasawa, which is loosely based on the plot. It revolves around Europol robot detective Geischt (Gerhardt) and is a more realistic retelling of the story.