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.

Frank Grillo had no idea who John Cena was before he was cast in "Peacemaker" Season 2, much to his son's dismay.

Along with possibly being the toughest new face in Peacemaker Season 2, Frank Grillo had the funniest scene off camera: admitting that he literally had no idea who John Cena was prior to working with