Latest AGENTS OF S.H.I.E.L.D. Poster Highlights Jaimie Alexander's Return As 'Lady Sif'

COULSON AND TEAM DISCOVER A LIFE-CHANGING SECRET AS LADY SIF RETURNS, ON "MARVEL'S AGENTS OF S.H.I.E.L.D." ON ABC

Jaimie Alexander Guest Stars as Lady Sif

"Who You Really Are" - Coulson and team come to the aid of a confused Lady Sif, who has lost her memory after fighting with a mysterious warrior, whose true mission will send shockwaves through S.H.I.E.L.D. Meanwhile, Bobbi and Mac continue to hide their true mission from everyone close to them, on "Marvel's Agents of S.H.I.E.L.D.," TUESDAY, MARCH 10 (9:00-10:00 p.m., ET) on the ABC Television Network.

After helping to thwart Hydra, Agent Phil Coulson was appointed as Director and tasked with rebuilding the agency. Agent Melinda May, expert pilot, martial artist and longtime friend, will continue to look after Coulson in the wake of the mysterious etchings he's been carving into walls. Grant Ward, highly trained in combat and espionage, was found to be a Hydra mole and a traitor to S.H.I.E.L.D. and locked up away from the world and his former teammates. But this isn't the last we've seen of him... After being left to die in the middle of the ocean by Ward, Agent Leo Fitz, brilliant engineer, and Agent Jemma Simmons, genius bio-chemist, found a way to escape their watery grave. But all did not go well for Fitz, who was left in a coma and may never regain his full cognitive functions; a devastating blow to Simmons. And computer hacker Skye, now a full-fledged S.H.I.E.L.D. agent, discovered her origins as a 0-8-4 — an object of unknown origin — and that her parents were considered "monsters." Could Skye have darkness lying dormant inside of her? Also joining Coulson's core team is Lance Hunter, a dashing mercenary sharp shooter with a quick wit. Since he didn't rise up through the ranks, does he have an ulterior motive for helping out the team.