Frank Grillo, who plays Rick Flag Sr. in the DC Universe, opens up about why he prefers his role in James Gunn's new superhero franchise in comparison to his time in the Marvel Cinematic Universe. While the MCU timeline has been around since 2008, some actors who appeared in various Marvel Studios productions have also ended up being part of DC's live-action legacy, too, including the newly launched DCU timeline. One of them is Grillo, who debuted as Rick Flag Sr. through animation in the Creature Commandos TV show, after portraying Brock Rumlow, a.k.a. Crossbones, in the MCU.