A "Monster Slayer" is your classical hero of epic fantasy and adventure who goes forth and kills a monstrous opponent, often an enemy that many other warriors have fallen to or refuse to fight - often a hero is tasked with slaying these monsters or lesser demons by a god (or God Himself) : in modern times the title can also apply to characters in non-fantasy settings who are known for hunting down and defeating equally daunting enemies (such as Ripley from the Alien series, famous for her on-going war with the Xenomorphs or the Doctor from Doctor Who who describes himself as "the man who stops the monsters").