Celestial Spiderman

Peter was the one that used the Gauntlet and the effects were world changing. Now, Peter is a immortal, the Guardian of the Stones--keeping them safe through the passage of time, starting from the beginning.

He was there when the planets started to form, and watched as civilizations grew. He got use to his new task, keeping a eye on the stones as they influenced the world around them. He had part of the stones with him, this was true--and he had long since master the use of them.

He lived like this for millennia, unchanged--until the year of 1940s on planet Earth.