Name – Monopticon
Species – non-organic lifeform
Planet – None
Temperament – Spies
Appearances – Four To Doomsday

Monopticons were floating spheres used by Monarch to spy on what was happening inside his ship. They were the most primitive of the non-organic lifeforms aboard, obeying simple instructions. The Doctor used his sonic screwdriver and his hat to fool the monopticons and stop them spying on him.