(Uatu) Fantastic Four #13 (1963); (as species) Strange Tales #53 (1964)
Their home-world exist in an unknown galaxy, far beyond the Milky Way Galaxy. It was covered with lush vegetation and bears no signs of inteligence life or habitation.
The Watchers possessed advanced technology existing billions of years before most other species. They used their advanced technology to create temporary dwellings which they disassemble after use. They also possess technology to observe alternate realities.
Ruled under leader The One.
The Watchers are humanoid beings, that dress in the clothing resembling cloathing of ancient monks or priest.
The page you're looking for appears to have gone missing! It's possible that it has been removed, changed or might be temporarily unavailable, but fear not, we've got our best guys on it. In the mean time...
Below are some suggestions to help you find what you're looking for:
You may also have better luck on one of these pages: