The Silver Surfer is a humanoid alien with metallic skin who can travel through space with the aid of his surfboard-like craft. Originally a young astronomer named Norrin Radd on the planet Zenn-La, he saved his homeworld from the planet devourer, Galactus, by serving as his herald. Imbued in return with some portion of Galactus' Power Cosmic, he acquired vast power, a new body and a surfboard-like craft on which he could travel faster than light. Now known as the Silver Surfer, he roamed the cosmos searching for planets for Galactus to consume. When his travels took him to Earth, he met the Fantastic Four, who helped him rediscover his nobility of spirit. Betraying Galactus, he saved Earth but was exiled there as punishment. In the alternate continuity of Earth X and Universe X, Shalla-Bal, Norrin's lover and the empress of Zenn-La, is depicted as joining him as a second Silver Surfer, both serving as the twin-heralds of the second Galactus.