Marvel's Agents of S.H.I.E.L.D. (2013)

S2E12 Who You Really Are

Coulson and his team come to the aid of a confused Lady Sif, who has lost her memory after fighting with a mysterious warrior whose mission will send shockwaves through S.H.I.E.L.D. Meanwhile, Bobbi and Mack continue to hide their true mission from everyone close to them.