Declassifying Marvel's Agents of S.H.I.E.L.D.: One of Us

Marvel: "Marvel's Agents of S.H.I.E.L.D." is back and we have details on who aims to take down the Agents in the third new episode of 2015!

Read the official synopsis below for the all-new episode before it airs on March 17 at 9:00 p.m. ET on ABC and stay tuned to for all things S.H.I.E.L.D. Be sure to follow @AgentsofSHIELD on Twitter and like "Marvel's Agents of S.H.I.E.L.D." on Facebook for all the latest news and updates!

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