OBSCURE O.V.A., *Kishin Corps

If Transformers had been let out during the 1940s, it might go a little something like this. This OVA was based on a light novel series written by Ghost In The Shell writer Masaki Yamada is an interesting look at alternate history.

Set in an alternate WWII, the Allied Forces not only have to deal with the Nazis, but alien invaders too. Germany and Japan are attempting to possess most of the alien tech they can find to win the war, while a special group of freedom fighters called the Kishin Corps use giant robots in their efforts to protect their country. Young orphan boy Taishi get caught up in this three-way war between Japanese, German and aliens made of goop. The Allied Forces are decidedly absent from this conflict which focuses on what would be the Axis Powers in our world.

Also known as Geo-Armor, this OVA series had some impressive mecha designs, and a great retro-future look. Director, Kazunori Mizuno of Bleach fame did a very professional job with the approach with this dieselpunk mixing of a WWII intrigue and sci-fi giant robots. If you wanted to watch Gigantor butt heads with invading enemies in the backdrop of a war theater then this retro-future classic.