Myrka (Bloodtide)
From Tardis Wiki, the free Doctor Who reference
A Myrka was encountered by the Sixth Doctor and Evelyn Smythe in 1835. It was in the employ of the Silurians, and it was trained to specifically kill a single target. Due to this programming, it was able to be turned against its Silurian masters. (AUDIO: Bloodtide)
