Dalek (The Wrong Woman)
From Tardis Wiki, the free Doctor Who reference
A Dalek of the Kembel faction was sent back in time from the 46th century as part of the Kembel Project's development of better time travel technology. Assigned to assassinate the First Movellan, (AUDIO: The Triumph of Davros) the Dalek appeared in a time bubble created by the Tenth Doctor in an effort to return to the post-Time War universe. The Dalek's gun destroyed the bubble and itself. (AUDIO: The Wrong Woman)