Frank Castle, former Marine and FBI agent now turned dedicated vigilante, begins a path of destruction through violent criminals across the country. After Castle kills a powerful mafia don, a previously exiled under-boss named Billy Russo returns to New York. Russo (eager to take control of the criminal underworld) convinces the remaining mob leaders that he can kill Castle, AKA the Punisher. The struggle turns in to a three-way battle when FBI agent Stephanie West aims to take both Castle and Russo off the streets.