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.

The actor experienced highs and lows on his journey with John Ecomomos, including losing his mother in between 'The Suicide Squad' and landing on 'Peacemaker.'