Jamie Alexander also known as Lady Sif has been confirmed to return to Marvel's Agents of Shield at some point within the second half of season 2, this has been confirmed by Marvel Entertainment, as of yet though we do not know which episode.
It has been said by Marvel Entertainment, Lady Sif will return to midgard striped of her asgardian armour and all memories of beening Lady Sif or even her love Thor. When found Coulson and his team have to try and help remind her of who she truly is with Thor possibly being tied up in the events of summer block buster
Avenger's Age of Ultron.
Could this be continued from [Thor: The Dark World](movie:206462) and have something to do with Loki pretending to be Odin? Could Sif find out the king she is serving is actually God or Mischief Loki in disguise? All will be revealed when Marvel's [Agents of S.H.I.E.L.D.](series:722469) returns on the 3rd of March