http://www.geocities.jp/jetter_mars2015/
Sorry the site's in Japanese, I coudn't get Google to translate properly, so if anyone could translate the site for me, I'd appreciate it.

Watch him fight with a hutensugi. What's a hutensugi, well it's a funny drawing of an ugly pig Osamu Tezuka's sister drew and it's appeared in most of Tezuka's anime and manga. It usaully shows up at random for comic relief.

Ok a bigger question you might ask, Who's Jetter Mars? Well he's basically the 70's version of Astro. In the late 70's Tezuka was in limbo. Having lost Mushi Productions in the early 70's and having lost the main manga magazine he published Astro in, back in '68, and he had not yet formed his new anime company Tezuka Prod., so he was on hard times, but he still had work with other studios, like Toei productions, hope I spelled it right. They are a toy company in japan, and yes there were a lot of Jetter Mars toys made from this anime.
I think at the time there may have been legal battles for him to use Astro with there studio, so he redesigned Astro and gave him a new name Jetter Mars, evan some new theme songs, there great. But the basic story of an innocent little boy robot that becomes a super hero is still there. Evan most of the same supporting characters are there, like Tameo, Shibugaki, and Kenichi are there, as well as Rock Holmes, I think Daddy Walrus too and lots more. Evan the villans are the same like Dam-Dam, the headless robot, and I think I saw Pluto in one pic.
This show only ran one season, about 27 eps. or so, but to this day, has a cult following. Here's the Tezuka link:
http://en-f.tezuka.co.jp/anime/sakuhin/ts/ts016.html