Mark VI combat mechanical

s were military robots. The Fleet created 5,000 of them for their wars.

Functionality
They had active phlebotinum armour, plasma-beam rifle in their right arms and a laser rangefinder, antigrav engine.

They moved using military-grade tank tracks and could move stealthily. They had sensitive audio-detection circuits.

History
The Thirteenth Doctor reprogrammed them, effectively turning them in a peacekeeping force. (PROSE: The Secret in Vault 13)