The Arquilian Galaxy is a tiny galaxy held by the Arquilians, a race of tiny humanoid aliens. According to Frank the Pug, the galaxy is the best source of subatomic energy in the universe, and because of this, Edgar the Bug comes to Earth to search for it.
The Arquilians are much larger than the galaxy itself, being over 200 times bigger. This suggests that the galaxy is not their point of origin, but rather something they have acquired over time. It is likely that they use the galaxy as a source of power, as its subatomic energy is incredibly potent.
The Arquilians' possession of the galaxy is a closely guarded secret, and they will go to great lengths to protect it. Edgar the Bug's attempt to steal the galaxy was met with swift and decisive action from the Arquilians, who were willing to destroy Earth if necessary to prevent the galaxy from falling into the wrong hands.
Story[]
When Agents J and K learned about the Bug's plot to steal the Arquilian Galaxy, they searched extensively for the Bug and the galaxy. The Arquilian's final words, "To prevent war, the galaxy is on Orion's Belt," were puzzling, as Orion's Belt is a series of three stars, not nearly the billions needed to contain a galaxy.
It was not until they spoke with Frank that they realized that the Arquilian could have been referring to tiny stars. After seeing a cat, J realized that the Arquilian meant his cat's collar, which was a toy galaxy made of tiny stars. Unfortunately, they were too late, as the Bug had already found the collar and the Arquilians revealed that they would destroy Earth if the galaxy was not returned.
The Bug ate the marble-sized galaxy and attempted to fly away in a ship. However, J and K shot down the ship, and after a fight, they finally retrieved the galaxy. In the end of the movie, it was revealed that every galaxy is actually marble-sized and held by some other aliens, who use them to play marbles.