Sorry, we have not watched this yet.
Astro Boy: Season 1, Episode 24 - The Greatest Robot in the World (Part 1) (1981)
Released: March 8, 1981
A power-hungry Sultan commissions a powerful fighting robot named Bruton (Pluto in the original), and sends him to battle seven of the world's strongest robots: Mont Blanc, Molnar, Brondo, Zeron, Hercules, Photar, and Astro.
