Rokushin Gattai GodMars: Juunanasai no Densetsu  

God Mars: The Legend of 17 Years, Rokushin Gattai God Mars Juunanasai no Densetsu, Six God Combination God Mars: Seventeen Year Old Legend, 六神合体ゴッドマーズ 十七歳の伝説, Rokushin Gattai GodMars: Juunana-sai no Densetsu

Marg was taken from his brother, Mars, by Zure and lost both his parents. As a result, he lived alone on planet Gishin. He joined a rebellion against Zure's dictatorship and fell in love with Ruru, the daughter of leader Ura. However, their organization was destroyed, and Marg was captured and brainwashed into becoming a soldier. His long-held wish to reunite with his brother was finally realized... through a duel. In the OVA, Gaia, God Mars, and Gishin robot Zeron receive redesigns while focusing on an alternate telling of Marg's life up until episode 19.