Heroism, with a hitch
Heroes fight villains, that is the common cliche. What about those who wish to improve the world's conditions permanently? Not like a certain group this one does not go off bumping dictators and land-grab at will. They use methods available in a superhero scale upon real-life problems that are easily solvable from another angle.
Phase 1: horde of alien invaders bent on subjugating the earth spotted entering through the bermuda triangle. Carrying an armada of life-wiping proportions, one that includes the likes of giant monsters and odd technology.
Phase 2: Africa is facing starvation problem, yet there seems to be no 'permanent' solution to this problem. The group takes it upon themselves to rid the world of one issue, without the need to be acknowledged for doing so.