The Stranger was born with the accumulated energy and intelligence from a race of beings who lived in the Andromeda Galaxy from the planet Gigantus. This race was soon conquered by the Eternians. As the planet fell, the Stranger became very surprised and wanted to seek more knowledge about living things. This though maybe only what the Stranger wants us to believe, His origin maybe a mystery even to himself. It has been stated by the Living Tribunal that he offered the Stranger the fourth face of his existence to represent the Stranger, but uninterested or not ready, the Stranger refused. The reason this position was offered to the Stranger is still a mystery.
The cosmic entity known as the Stranger debuted in X-Men #11 (March 4, 1965).