I can't help but notice that this giant robo is usually ignored. Sure it was used only ONCE. In guidebooks about the giant robots, it's usually put in the pages with the other recolors of the other robos that never even appeared in the series. They never use this in Timeranger VS GoGoV, they have a perfectly good robot right here. For crying out loud, it slayed two henchmen powered by the witch herself, which is so powerful that none of the robos stood a chance against them, even combined. The Sigma Project may not be a secondary mecha of some sort like Victory Mars, or Grand Liner, but it is the first of the recolored or remold of the primary mecha. It's like Gao God, Bakuren Oh, Engine Dai Shogun.