Frank Grillo had no idea who John Cena was before he was cast in "Peacemaker" Season 2, much to his son's dismay. The "Warrior" actor has a key role in the second season of James Gunn's "Peacemaker" as Rick Flag Sr.

In fact, Grillo made a shocking admission that he had no clue who John Cena is, until he joined the cast of "Peacemaker." Grillo spoke to GQ about his entrance in the DCU, how comics have impacted his life since the Palisades fires, and how he has connected with his sons on everything superheroes.

DC Studios co-CEO James Gunn reveals how John Cena's acting skills have impressively evolved since Peacemaker's first season. Get the scoop on Cena's emotional depth in the show's second installment!