Menelvagor is a planet within The Commonwealth. It is the homeworld of the Menelvagorean race.

It is a strange world in a triple star system. The world has an elliptical orbit oddly constrained by the gravitational forces of the stars in the system (though the smallest and most distant of the stars really exerts little influence on it). Life sprang up in the massive, ever-shifting fissures beneath the surface of this very hot world; the Menelvagoreans represent the highest form of that life.