Peter Petrelli is the younger son of Arthur and Angela Petrelli, and Nathan's brother, and worked as a common hospice nurse caring for Charles Deveaux while living in New York City. Peter appeared to his family as a hopeless dreamer, who believed he had a greater place in life than just saving one life at a time. He discovered he was an evolved human who had the ability to absorb and use the powers of other evolved humans, although this ability was stolen by his father. Peter used the formula and replaced it with a less potent ability. After the existence of evolved humans was revealed to the world, Peter unwittingly found himself as the face of the Petrelli Movement, a faction of "evos" who work to save other evos from persecution and is violently opposed to the Evo Registration Act.