10 Most Powerful Supervillains You’ve Never Heard Of
3. Michael Korvac
As a cyborg who was able to siphon the powers of Galactus at whim, Michael Korvac is arguably one of the most powerful beings in the universe, if not perhaps the entire Marvel multiverse.
Because unnervingly, Korvac's abilities do not stop at his ability to copy Galactus' powers, as he is also capable of using his super-computer brain to analyse energy or fighting styles aimed against him, allowing him to create a perfect defense against them - something that would make him nigh-on invulnerable when it came to fighting.
But these immense powers come at a price, as Korvac being so immensely strong appears to have resulted in writers dodging using him, as any character with Galactus-level abilities would naturally prove a huge problem to try and have heroes believably beat. That said, if any modern writer cared to bring an established cosmic big bad, Korvac would be the perfect guy to pick.