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.

"Marvel's Agents of S.H.I.E.L.D." stars Clark Gregg as Director Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Grant Ward, Chloe Bennet as Agent Skye, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons and Nick Blood as Lance Hunter.

Guest starring are Adrianne Palicki as Bobbi Morse, Henry Simmons as Alphonso "Mack" Mackenzie, Jaimie Alexander as Lady Sif, Eddie McClintock as Vin-Tak, Alexandra Manea as nurse, Lidia Porto as head nurse, Danny Lopes as Bruno, Ben Griesse as Tiago, Ruben Rabasa as Mr. Cardozo and Markell Andrew as officer Carvalho.

"Who You Really Are" was written by Drew Z. Greenberg and directed by Roxann Dawson.

"Marvel's Agents of S.H.I.E.L.D." is broadcast in 720 Progressive (720P), ABC's selected HDTV format with a 5.1 channel surround sound. This program carries a TV-PG,S,V parental guideline.

For more information on "Marvel's Agents of S.H.I.E.L.D.," visit ABC.com