Alien (Doctor Who - The Ninth Doctor)
From Tardis Wiki, the free Doctor Who reference
In a possible future for the Eighth Doctor, (PROSE: The Tomorrow Windows [+]Loading...["The Tomorrow Windows (novel)"]) an alien race of "monsters" was responsible for killing nearly every Time Lord on Gallifrey, but they were defeated by the Ninth Doctor and the Master. The Master's final physical body was destroyed in the process. (PROSE: Doctor Who - The Ninth Doctor [+]Loading...["Doctor Who - The Ninth Doctor (short story)"])
