Frank Castle, known as the Punisher, is a fictional character from Marvel Comics. He is a vigilante who uses lethal methods to fight crime, motivated by the brutal murder of his family. With his background as a Marine, he's highly skilled in hand-to-hand combat, marksmanship, and guerrilla warfare. The Punisher is known for his relentless pursuit of justice and his willingness to operate outside the law. He plays a significant role in the Marvel Universe, often crossing paths with superheroes like Spider-Man and Daredevil.