Allegedly, this series was licensed to be adapted as the third "Voltron" season, but was scrapped after the segments culled from "Gatchaman" became a hit. The Gerinya Empire attacks the Earth after hundreds of years of peace. The last hope seems to be Dr. Mizuki's trio of Arbegas robots that combine to form one giant battlebot. One of Watanabe-san's early anime scores, it follows the standard pattern of composing themes for all occasions, many in short bursts or variations on a theme. Very 1970s in style, a Hammond-like organ is used to back up the orchestra. Included are stereo versions of the songs.