Marvel's Agents of S.H.I.E.L.D. Season 2 Episode 21 : [*S.O.S. (1)*] br Airs : Tuesday, at 21:00 br Network : ABC br Episode Plot: br S.H.I.E.L.D. puts everything on the line to survive a war that blurs the line between friend and foe. Coulson and his team will be forced to make shocking sacrifices that will leave their relationships and their world changed forever.