9. The Krillitane
Aside from the fact that their leader is Giles from Buffy/the Prime Minister from Little Britain the Krillitane are awesomely evil beings. In a dastardly swoop they take control of a school by replacing the teachers and turn the children into computer processors by feeding them modified chips for lunch that boost their productivity. Oh and did I mention that the Krillitane have a penchant for eating the occasional child? They turn the school into a locked down prison as they hunt down the Doctor, Rose and of course Sarah Jane and K9. When they are in their true form they are winged creepy gargoyle looking creatures with huge teeth and claws. Theyll mess you up, if the Doctor doesnt mess them up first. Sadly the Giles Krillitane dies at the end of the episode so although the enemy may eventually reappear, the Prime Minister wont likely be among them. Great enemy from a classic episode which sees the Doctor reunited with K9 and Sarah Jane.
Best Quote: No parents. No one to miss you. I see why the nurse sent you. You poor child. Poor... thin... child. Come inside. It's nearly time for lunch.
Appearances: School Reunion