Clark Gregg: There's something American in the tone of superhero movies

On Tuesday's SI Now, "Agents of S.H.I.E.L.D" star Clark Gregg discusses what it is like to play his character Agent Phil Coulson in different roles and what he

On Tuesday's SI Now, "Agents of S.H.I.E.L.D" star Clark Gregg discusses what it is like to play his character Agent Phil Coulson in different roles and what he thinks about superhero franchises.