After his home is conquered by the tyrannical emperors who now lead Rome, Lucius is forced to enter the Colosseum and must look to his past to find strength to return the glory of Rome to its people.
In Mexico City, a former assassin swears vengeance on those who committed an unspeakable act against the family he was hired to protect.
Robert McCall finds himself at home in Southern Italy but he discovers his friends are under the control of local crime bosses. As events turn deadly, McCall knows what he has to do: become his friends' protector by taking on the mafia.