Alright, let me make a pitch then.
The basic concept is for a world, Twenty Minutes Into The Future, where technology has developed to the point where it makes natural superhuman abilities redundant - powered exoskeletons, anti-gravity generators, handheld energy weapons, medical nanobots - essentially a realization of Syndrome's intent for 'when everyone is super, no one will be'. Any beat cop can do the job of a superhero/ine, while supervillains are no longer distinguishable from your run-of-the-mill criminals. So they start retiring, on both sides, with fewer and fewer natural superhumans being born, until new superhumans just stop appearing entirely with only the (slowly) aging veterans of the last generation to show the Age of Capes ever happened.
And then the aliens attack. An extradimensional swarm of Bug People, they rapidly overwhelm and crush Earth's defenses by means of projecting strange anti-tech fields that shut down modern technology while allowing their own bio-tech to function. As they settle in and begin strip-mining the planet of anything and everything of value, humanity is driven underground (sometimes literally), fighting a desperate resistance movement to save their own planet. But the only people who can really turn the tide are those veteran capes; ex-hero or ex-villain, united under the shared banner of their planet and people.
It's meant to be more on the gritty side of the scale - a grim setting that makes the shiny bits of heroism stand out all the better, plus a moderate amount of Body Horror from the aliens, so I'd want to stash the game in Extreme if possible (though not at all required).
Either 2e or 3e is acceptable as a base ruleset (assuming this is interesting), using whatever the 'average' Power Level is for starting characters.