Ironicus

General Ironicus was the robot regent of an alternate Earth where Rome never fell, and the commander of its robot legions. Unlike his legionnaires, his head was shaped like an eagle's to reflect the Imperial Eagle of Rome. He had a chestplate light that glowed purple when it was permitted for others to speak to him.

After conquering the entire galaxy, Ironicus began leading his legions in attacks on other dimensions, starting with a small English village. The Fourth Doctor was present and followed them home, where Ironicus captured him and threw him to the Ectoslime. When he avoided death, the General made him a slave in the Imperial air galley. The Doctor escaped and, when he failed to recapture him, Ironicus was destroyed by Magog for his failure. (DWM: The Iron Legion)

Years later, when a Vortex parasite attacked the Doctor's TARDIS, it summoned images of the Doctor's enemies, including Ironicus. (DWM: A Life of Matter and Death)