Declassifying Marvel's Agents of S.H.I.E.L.D.: Who You Really Are

Marvel: Jaimie Alexander returns to "Marvel's Agents of S.H.I.E.L.D." as the Lady Sif once again in the season's twelfth episode, and we've got the first details on our heroes' all-new adventure right here on!

Read the official synopsis below for the episode airing March 10, and keep your eyes on for S.H.I.E.L.D. updates. Also follow @AgentsofSHIELD on Twitter and like "Marvel's Agents of S.H.I.E.L.D." on Facebook for all the latest news!

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