What is an "Omega mutant," and what makes them different from regular mutants? Storm, who is about to get her own ongoing series as part of the new X-Men comic relaunch and who just joined the Avengers, is considered an Omega mutant - one of the most powerful mutants, by Marvel's concept of mutant power classification.
Mutant classification is a long-running idea in Marvel Comics, going back in some form another almost as far back as the idea of mutants themselves. And with that much history, all wrapped up in the complications of a decades-long sequential narrative, there's a whole complicated theory of comic book science behind measuring, comparing, and classifying the powers of mutants.
