Iron Legion

An world where the Roman Empire never fell and eventually conquered the galaxy using legions of robot soldiers. The empire is ruled by a child emperor, Adolphus Caesar, but the true power behind Rome is the Malevilus, five winged demonic creatures who feed on death and have been supplying Rome with the technology to wage its eternal war. The Fourth Doctor visited this world while tracking a robot legionnaire that had crossed into his own dimension through a Dimension Duct.