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 joined the cast of “Peacemaker” season two, playing the role of Rick Flag Sr. He joined John Cena, who stars as Peacemaker, in the series. Speaking to Derek Lawrence of GQ, Grillo admitted he didn’t know who Cena was before he joined the series.

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