Iron Legion

The Iron Legion was an army of robots in an alternate Rome that had conquered the galaxy. They were led by General Ironicus. They used infrared vision and could detect heartbeats with their sonar. The Iron Legion took prisoners from other dimensions to feed the Malevilus as offerings. They were defeated when the Fourth Doctor programmed the Bestiarus to start a revolution by attacking the Iron Legion at key points throughout Rome. (COMIC: Doctor Who and the Iron Legion)