Gigantor (1963)

When terrorist groups, evil criminals and aliens become too strong even for Earth's over-stretched armed forces, the virtually-indestructible robot, Gigantor, is built to combat them.

Gigantor is an anime show featuring Kazue Takahashi and created by Mitsuteru Yokoyama.

Gigantor is currently streaming for free (ad-supported) on Freevee and The Roku Channel and it's also available on Crunchyroll.