When first introduced, Immortal Man is reborn as a boy in modern times and has trouble remembering his origins. Found outside an orphanage, his caretaker finds a jeweled amulet around his neck and decides to keep it safe until the boy is older. Without it, the boy has no access to his power or previous life memories. Wanting freedom and confused by his expert level knowledge in a variety of fields (such as bullfighting, Japanese Samurai culture, and culinary arts), he runs away. After a few years, the now adult orphan returns to the orphanage to investigate his past and is finally given his jewel amulet, restoring his powers and memories. He recalls belonging to a "strange, ancient race" of cavemen who possessed superpowers. Thanks to a magical amulet given to him by the tribe chief, he is tasked to protect people from evil throughout eternity by constantly reincarnating in different bodies, sometimes older, sometimes younger. Over the millennia since, the Immortal Man has been a Babylonian, an Egyptian, a Greek, a Roman, a Carthaginian, an Arab, a European knight, a Mongol, and many others.