Marvel's Agents of S.H.I.E.L.D.- The Key to Mack and Yo-Yo's Relationship

Henry Simmons and Natalia Cordova-Buckley reveal what makes their characters Mack and Yo-Yo work despite all the hurdles and the fate of the world always on the line. Don't miss the 2-hour Season 6 finale of "Marvel's Agents of S.H.I.E.L.D." this Friday, August 2 at 8|7c on ABC!