Outside of one Samuel L. Jackson appearance as Nick Fury back in the TV show's second episode and Cobie Smulders popping up as Maria Hill, fans of Marvel's movie characters haven't seen a lot of cameos on ABC's Agents of S.H.I.E.L.D.

They'll get a treat in the series' 15th episode, however, when Lady Sif, portrayed by Thor and Thor: The Dark World actress Jaimie Alexander, will make an appearance.

Marvel announced her appearance Friday during the Television Critics Association press tour. Apparently, Sif will come to Earth from Asgard with "a very specific mission." That leaves a lot of room for speculation, of course. Maybe she's picking up a big White Castle order for Volstagg?

Either way, her appearance marks the first time a superpowered movie hero will appear on the show, which has been touted as tying into the Marvel movie universe from the beginning.

The show returns from a brief break February 4 with its 13th episode, which will include a cameo appearance from Stan "The Man" Lee. Here's a trailer for that episode:




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