In feudalism, an overlord was a lord having authority over other lords. In military history Operation Overlord, codename for the invasion of Normandy by Allied forces during World War II In fiction Overlord (comics), a comic-book supervillain created by Erik Larsen Overlord (Transformers), a Transformers character Overlord (alien race), a non-human species in the book Childhood's End by Arthur C. Clarke "Invasion of the Capital" / "Over Lord", an episode of the TV series RahXephon wit… (More on Overlord)