The terms "Alpha" and "Omega" (roughly meaning "first" resp. "final") are blurry in-universe terms used by some writers to categorise different characters. Omega mutants are, in theory, supposed to be the most powerful class of mutants, but with time the scope of the term has widened to include a much wider scope of characters that, following the same logic, could technically qualify half the ones in existence.
- Originally omega mutants were beings with vast control over matter and energy, such as Iceman, Phoenix, Legion.
The term "Alpha mutant" (less powerful) can, but does not necessarily, intersect.