John Cena played the antihero Peacemaker in the 2021 film 'The Suicide Squad'. Peacemaker, also known as Christopher Smith, is a vigilante who is willing to take extreme measures in pursuit of peace. Despite his violent methods, he believes that his actions are justified if they lead to a greater good. Cena's portrayal of the character has been praised for being both humorous and menacing. The film has been a critical and commercial success, and has led to the announcement of a spin-off series centered around Cena's character.