Motherburn was a large pink battleship that appeared in UFO Robo Grendizer that first appeared in episode 1. Its primary function was to store saucer beasts and minifos. It was under the command of Gandal and Blaki. A smaller green variation created by the Vegan imperial officials called simply Mothership as used by a saucer beast captain named Gorman in episode 7 primarily to store his saucer beast, Gingin.
Read more about this topic: Fortresses (Mazinger)