Tetsuwan Atom (1980) - episode 24 - 17 Mar, 1981

A power-hungry Sultan commissions a powerful fighting robot named Pluto (Bruton in the dubs) with 1 million horse power, and sends him to battle 7 of the world's strongest robots: Mont Blanc, Molnar, Brondo, Zeron, Hercules, Photar, and Astro. Bruton manages to easily destroy Mont Blanc by catching him off guard. When he heads to battle Astro, he instead is met by Uran, who tells him Astro won't fight him. Bruton takes Uran hostage to lure Astro into a fight, and goes and destroys Molnar. When Astro catches up to Bruton, the robot wrestler Brondo appears, looking to avenge the death of his friend, Molnar. Bruton returns Uran to Astro, and takes on Brondo; however, he is heavily damaged in the fight. He begs for Astro to activate his summoning beacon to call his master; Astro does so, earning Bruton's gratitude. Later, Astro is contacted by Zeron, who has a warrant for Bruton's arrest. Soon after, Zeron is challenged by Bruton, and nearly gains the upper hand until Bruton rips his body in two. Soon, Dr. Elefun locates the Sultan's palace and flies there, with Astro tailing him. The Sultan holds Dr. Elefun hostage, as a bargaining chip to make Astro fight Bruton. Bruton returns to the palace and encounters Astro, and the two battle until Bruton catches Astro in his hands, and threatens to tear him apart. (Source: Wikipedia)