Star-Moon Alliance

The Star-Moon Alliance is an organization of cycloptic aliens, Galaxoid and Nebular among them, seeking to colonize other planets; at one point, Earth became one of their targets, and Galaxoid & Nebular were able to negotiate the colonization of the planet with its apparent leaders (Calvin and Hobbes). The Alliance itself is never seen, but the two aliens make it clear in the "Dimension" saga that their intentions are not hostile, and that they thrive in peaceful living on their homeworld—though they are prepared to go to war when necessary, as referenced when Calvin was initially hesitant to hand over the Earth, and when the Alliance as a whole agrees to help the group of heroes battle Doctor Eggman in "Dimension Mix-Up" (as thanks for their liberation from the Irken Armada's invasion). The Star-Moon Alliance has an unseen leader, who seems to have a great deal of faith in Galaxoid and Nebular, seeing as the two of them are appointed ambassadors and they managed to convince their leader to assist in the War Above Earth to begin with. Since these events, the Alliance has proven capable of recovering from conquest, in that their homeworld is said to have been restored to its prosperous state.