This question already has an answer here:

We see how Charles Xavier getting shot as a young adult (In First Class) and have to sit in a wheelchair. But in the beginning of The Last Stand when he visits Jean Grey with Eric he walks, how can this be?

marked as duplicate by Jason Baker, Community Apr 23 '15 at 15:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged or ask your own question.