Tourian

 is a part of Tourian, the main headquarters and research facility of the Metroid Series. Many Metroids are present here, as this is the place where there're getting researched and cloned hundreds of times. It's also the area where the final boss, Mother Brain, is fought.

In M.U.G.E.N, was made by EXShadow, MaxBeta and Waffles. The battle takes place in front of Mother Brain, who watches the players. Metroids can also be seen in the background.