Reviewed By Eric Switzer. This week on Marvel’s Agents of S.H.I.E.L.D. Lady Sif returns on another man hunt, this time for a Kree warrior on an unknown to erase some minds, including Sif’s, with a magic truncheon. ‘Who You Really Are” first seems like a one off episode but it actually deepens the inhuman mythology in a big way and impresses with just the right amount of twisty-turny plotting. You don’t have to say “Lady Sif episode” twice to get my attention, but I was pretty pleased with this episode as a whole.