The Mong were the last of the ancient people of the Galaxy.
At some point in the past, the Mong were almost destroyed by an unknown event. Ceres was the only Mong who survived. After his defeat against Rick and Molly on Alwas he returned to his home planet.
Their homeworld was a huge planet surrounded by two sets of bright yellow energy rings. On the surface of this planet, the Mong people lived in huge cities, with very tall buildings.
Mong abilities consist in their manipulation of gravity, like Ceres' starship. They also can manipulate minds through extremely beautiful flute songs.The Mong are also an extraordinarily long lived species, as Ceres lived for centuries.