Doredsor
From Tardis Wiki, the free Doctor Who reference
A Doredsor was, according to the Second Doctor, a "living creature that eats time". They were electrical beings born at the very instant a galaxy forms. Hence, they usually existed in the centre of galaxies, but the Doctor and Jamie McCrimmon encountered a dying Doresdor in Prague. It was the cause of events disappearing from history. The Doctor and Jamie took it into the TARDIS where it finally died. (PROSE: The Time Eater)
