When it comes to Marvel Comics, no origin story is safe. One issue and one retcon can change everything we know about a character, and the X-Men are especially vulnerable to such tinkering. The genetic differences in mutants can come from all over the comic book world, and often they prove to be hereditary. That’s how the powers of Kurt Wagner, aka Nightcrawler, were originally explained: his physical similarity to blue-skinned shapeshifter Mystique came from her being his mother, while his father was Christian Wagner, a German baron.
