Really, what's surprising is how much the Metroid characters don't seem out of place mixing up in Contra land. If Nintendo had made Contra instead of Konami, I bet this crossover would have happened long ago. It just works a bit too well.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.