Gatchaman
Has anyone ever watched or heard of Gatchaman? It aired and was edited in the US as Battle of the Planets, G-Force, and Eagle Riders. It was one of the earliest henshin animes made by Tatsunoko in the 70s.
http://www.youtube.com/watch?v=sCHSmKk_ujE&feature=related
For anyone who wants know more about it: