The mythology of Highlander is based around the existence of Immortals. Immortals are both born and made, a latent immortal will live and age normally should no violence befall them during their lives, but should a potential immortal meet with a violent death, that person would awake from the that death, their aging process stopped, their ability to heal increased. Without a violent death the potential Immortal ages normally and dies a natural death. No immortal, latent or active, can reproduce.