Magla

Magla was an enormous amoeba in space. It had a crust-like shell. Its size (8,000-mile-wide) and appearance made it resemble an actual planet, which, according to Origins of the Universe, hosted no additional life. (TV: Destiny of the Daleks) According to one account, it was associated with the Tenth Galaxy. (PROSE: Doctor Who and the Destiny of the Daleks)