P. Xavier was the brain dead twin brother of Charles Xavier. Due to his family's considerable wealth and fortune, and likely due to his own latent Mutant abilities, P. was able to survive death and remain on life support. When Charles was seemingly murdered by Jean Grey, he was able to transfer his memory and activite P.'s mutant abilities. However, due to the fact that the body had not been used, Charles was ironically again confined to a wheelchair.