Skrawn

The Skrawn are a race of giant insects originally from the planet Kolox who are armed with a particularly lethal sting. One scratch is enough to bring on an anaphylactic shock in its victims and a long painful death following a full sting. Bitter as a result of their home world’s destruction in the Time War, they are driven by a desire to avenge and rid the “human filth”. Their highly developed sense of smell is capable of detecting time travellers such as the Doctor.

Skrawn ships are organic constructs, grown from cellular electron amoeba and capable of carrying Skrawn hives. Capable of travelling through the Kolox Nebula, they were not designed to be able to navigate the Time Winds (hence their failed attempt to steal the experimental time-nav system from the astroliner Tritanic in the fifty-ninth century) (DWAM: The Skrawn Inheritance)