For those not in the know, the Mechanoids were an intended enemy of the Daleks created by Terry Nation. Their sole appearance was in the 1st doctor episode, The Chase. I feel that these would be a good addition, as their flame thrower weapon would be unique, their polygonal design would fit the style well, and the obvious Dalek connection. Also, there's a severe lack of classic monsters outside of the Daleks and Cybermen.