S'tonge of the Galaxium is a character in Sparks Nevada, Marshal on Mars, and a part of The Great Thrilling Adventure Hour / Welcome to Night Vale Crossover. He is played by Wil Wheaton.
The members of the Galaxium are omniscient, and possess The Force Galactic, the most powerful force in the universe. The only other known being other than a member of the Galaxium to possess The Force Galactic is currently the Barkeep, though Croach temporarily possessed it due to being inhabited by V'stalu.
As a member of the Galaxium, it's his blessing and curse to watch the events of the universe, even the boring parts, and record these events with his Pen Cosmic. It is a lonely job, but S'tonge laments he cannot create a woman to keep him company because as soon as she figures out what he did, she will leave him. He knows this via omniscience.
In the crossover episode, S'tonge speaks directly to the audience, introducing himself, the Galaxium the rules and the sponsors of the Crossover episode. S'tonge also takes the place of Folksy Hal as the narrator. On a meta level, this is partially because Hal Lublin was playing Steve Carlsberg, a Welcome to Night Vale character.
When the entire universe is on the brink of ending due to Dolores County undoing the events that Claxon and Samuel Bolt performed to erase Pemily Stallwark from history and thus let the moon get destroyed and yet still existing herself, S'tonge appears in The Marshal Station. S'tonge tells those present that he will save the universe, disobeying the ordinance that normally prevents him from interfering in the events of the universe, should Dolores agree to marry him and become his cosmic bride. Dolores offers to date him first, but when S'tonge says it's marriage or he'll let the universe end, Dolores turns S'tonge down, and S'tonge leaves without saving the universe.