The Galactonian Mothership was one of the most nefarious and destructive vessels in the known universe. It was capable of destroying a proportion of Earth at a time. [Something Risa mildly succumbed to) The Galactonian Mothership was only disabled/damaged once due to operator failure when a Radiolytic agent spread across 8 of the lower km of the ship. Only extremely short surveys and skirmishes on the lead to basic detail about it being revealed.