Watcher

Uatu made an appearance in Marvel series.

History
The Watcher is many times the superior of any mere man. All he does is travel his lonely route, stopping from time to time to look around as history unfolds. It is as if his only mission is to watch. His home planet is at the furthest end of the known universe, a planet containing the greatest scientific wonders of all time. If one was to seize some of these scientific treasures, he would have such power as no human has ever dreamed of possessing.

One of the first races in the universe, The Watchers developed technology and evolved billions of years before nearly all species. With the best of intentions the Watchers used this knowledge to interfere with the evolutionary and technological advancements of a primitive species. The residents of Prosilicus, not ready for these advancements annihilated one another with this new technology.

The Watchers horrified by these actions, swore to only observe and never to interfere with the happenings of the universes

Later, A Watcher observed a not yet formed Galactus in a cocoon. Honoring their oath of non-interference the Watcher watched as Galactus came to be the Devourer of Worlds.

Power and Abilities
The Watcher has an eternity to stand and watch, there is almost nothing he does not see, almost nothing he does not know. For he is the Watcher.

He is forbidden to interfere with the acts of others. Though he has the power to shatter planets, to make galaxies tremble, he may only stand, and watch. However, the Watcher may act only if it is to preserve his own safety.

The Watcher is not all-powerful. The seeming miracles he accomplishes are done through mastery of science which no human brain can remotely comprehend.

The Watchers are cosmic beings, who possess the innate ability to achieve virtually any effect desired, including augmenting personal attributes, time and space manipulation, molecular manipulation, energy projection and a range of mental powers. They also have access to incredibly advanced technology.