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The derelict mothership is a ship of unknown origin encountered by Galactica.
The mothership herself is surrounded by seven freighter-sized space craft, themselves derelicts, and is twenty-times the size of Galactica.
An expedition lead by Captain Apollo is sent to investigate the mothership. While onboard, Lieutenant Starbuck experiences a vision where one of the carcasses turns into Apollo and tells him that he must have Starbuck's soul. Doctor Wilker is separated from the expedition, himself attacked (Prison of Souls, Part 1) and possessed by a Somnian (Prison of Souls, Part 2).
- The reason for its dereliction is never specified, but likely has something to do with the Somnians's attempts to enter the universe occupied by the Humans.