Nemesis is the fictional name of the Luftwaffe's KG 200 and is the nemesis group to the fictional RAF Battlehawks
Lord Nemesis is the 180+ year old "Prussian Prince of Automatons" and leader of the Nemesis Army villain faction in the Online game "City of Heroes/Villains". He is both directly and indirectly responsible for many of the games storylines and major plots, including the Rikti War, the Sky Raiders, and the criminal organization known as the Family.
Nemesis is presented in Final Fantasy X as the most powerful enemy in the game, unlocked by finding all species and defeating all other monsters in the battle arena
Nemesis appears in Persona 3 as the first Persona of Ken Amada; following a change in his personality, the Persona transforms into Kala-Nemi. Both Personae or of the Justice Arcana and attack with Light magic.
Nemesis is the name of a planet-sized mass thrown out by the blind idiot god Azathoth that orbits our sun and whose passage brings about chaos and destruction in the Spawn of Azathoth campaign for Chaosium's Call of Cthulhu roleplaying game.