Smiler

Smilers were a type of android used aboard Starship UK.

History
The Smilers were mounted in booths around the Starship UK. If at any time a citizen broke the law or was deemed unnecessary, the Smilers would feed them to the Star Whale (except for children who were sentenced to work in the Tower of London). The Smilers rotated their heads to show three faces: happy, displeased (for warnings), and Anger (when attacking). While they had three faces, they appeared to rotate their heads 180 degrees (which should mean they only had two). This might mean that faces could be removed when they rotated.

While Smilers initially appeared to be merely heads, in extreme circumstances they could leave their booths and attack. The terrified population kept their booths clean and never dared get too close to them. The Smilers could quickly repair themselves from damage such as being shot. (DW: The Beast Below)