The Watcher is a being that lives in Space and "watches" everything. He is a neutral being that acts as the objective side in conflict, so he will not actively help hero nor villain.
The Watcher appeared in Marvel's Avengers Assemble as a cameo, where he and the Hulk were watching a baseball game.
Watcher made a full appearance in Hulk and the Agents of S.M.A.S.H., living on the blue side of the moon, an area where there is oxygen. He watched the Agents of S.M.A.S.H. take on their Jump Jet.
Several Watchers are seen meeting with their informant in the film. While listening to the informant's stories, they see the Quadrant ship pass through their world. At the end of the film, they grow tired of the informant and leave.
- While the primary Watcher is named Uatu, his race as a whole are also Watchers. Uatu used to be owned by Fox prior to its purchase by the Walt Disney company.