G is the second Super Robot Series game for super gameboy.
The story of it is about a scientist found out some alliens are going to take over the world, and that scientist build a army called DC and try to united the whole world before the aliens come. And a organization called London Bell, a organization with gathers all the robots around the world such as Gundam, Getta, Mazinger Z, etc, try to stop DC from reaching that goal. This game is just like the other simulation strategy games in most part. But his this game, player can switch pilots to different robots. Some robots are stronger which some certain pilots using them because some attacking moves require some certain abilities to use it and only certain pilots have those abilities.