Frank Castle, an undercover FBI agent, successfully completes what he intends to be his final mission before retirement. After a sting operation to arrest arms dealer Otto Krieg, the operation goes sideways, leading to the unintended death of Bobby Saint, the son of powerful businessman and crime lord, Howard Saint. In retaliation for his son's death, Saint orchestrates a brutal massacre at a family reunion, where Castle and his entire family are celebrating. Castle miraculously survives the onslaught, though he's left grief-stricken and near death.

Wounded in body and soul, Castle retreats to a quiet life in a dilapidated tenement building. As he recuperates, he plots his vengeance against those responsible for the slaughter of his loved ones. Resurrecting himself as a vigilante, he takes on the moniker of The Punisher. Armed with a personal arsenal and driven by a fierce resolve, Castle embarks on a relentless crusade to dismantle Saint's empire, using his tactical expertise and intelligence to turn Saint's associates against him and tear the organization apart from the inside, all while evading the grasp of law enforcement who are on his trail.