The Yeti robots were large and hairy to disguise themselves in the Himalayas. Their claws, feet, and eyes were the only parts not covered in fur; their claws and feet were black and bumpy, their teeth yellow, and their eyes green. The "Mark I"s were bigger and more bear-like, whereas the "Mark II"s in London had better-defined hands capable of wielding web-guns. These Yeti had flaps at their chest which hid the control spheres that provided their motive power, serving as a brain. Yeti could also be directed somewhere through the use of a locus. Until activated, Yeti could stand immobile for long periods, completely shut down and unaware of what went on around it. When instructions did arrive, it would come to life and begin moving.