Comments: Gazing down on Earth from the Blue Area of the moon, one being has born witness to the storied history of our world for untold millennia. Uatu is the emissary of a vastly powerful race of Watchers pledged to observe from a safe distance the ebb and flow of the universe -- but never act to alter the course of events. In direct defiance of his culture's code of conduct, the Watcher has been known to make his presence felt in the face of cataclysmic threats to Earth!
Source: Marvel Comics - Fantastic Four, What If?, Earth X