Hamegg (also known as Grudon) is the ringleader of the robot circus. He is best known for his selfishness and greediness.

1960s series

In the 1960s series, Hamegg is in charge of the Robot Circus which could be easily compared to a Roman colosseum. After Astro is sold to him by Dr. Tenma, Hamegg forces Astro to participate in the circus. Because Astro would not destroy his opponent, Hamegg punished him by not giving him fuel. FIXME

1980s series


2003 series


2009 feature film


Little Astro Boy (2014 Series)

Hamegg plays the role of lead antagonist in Little Astro Boy. Along with his lackeys, Gora and Dr. Flau, he tries to cause mischief for Astro and his friends, but always fails to do so, which results in his ideas backfiring on him.


In the Japanese version of the 1980s series, he is voiced by Ichiro Nagai.

In the Japanese version of the 2003 series, he is voiced by Yuuichi Nagashima (also known as Cho).

In the 2009 feature film, he is voiced by Nathan Lane.

In Little Astro Boy, he is voiced by Cole Howard in the English version and by Riki Kitazawa in the Japanese version.