The Moxx of Balhoon was a main leader of the League in the year 5 billion. He was a strange blue alien who spat at people to great them. He couldn't walk because he is so fat, and he can hardly even move. He was killed when he went to see the Earth finally die, as its Star expanded, when a beam of solar heat smashed through the glass of the station and burnt him to a cinder, along with everyone else in the room.
Coincidently, the Face of Boe was at the Earth's deathday event too, but, by pure fluke, he was out of the room when the tragedy occured.