WARNING: The following contains spoilers for Loki Episode 4, "The Nexus Event," streaming now on Disney+.
The latest installment of Loki sees the return of a long-lost character from the Marvel Cinematic Universe. Fans haven't seen Jaimie Alexander's Lady Sif since her last guest appearance on Agents of S.H.I.E.L.D. in 2015, and while she's set to return in Thor: Love and Thunder, her cameo in the Disney+ series still comes as a surprise.
Unlike The Avengers and Frigga's appearances, however, Sif's role wasn't stock footage, with her appearing in a TVA illusion meant to break the God of Mischief. But while her cameo shed some light on her dealings with Loki in the past, it also took inspiration from a classic piece of Norse Mythology.
Loki encounters Sif after being apprehended by the Time Variance Authority on Lamentis-1. Once he's separated from Sylvie, he's tossed into a Time Cell by TVA agents on Mobius's orders, as a way of softening him up before interrogation. Loki then finds himself back on Asgard, where he's approached by a furious Sif, who's holding a lock of hair the God of Mischief cut.
Loki seems happy to see a familiar face, at least until Sif punches him. Initially, he scoffs at the idea of the "bad memory prison," but after she knees him in the groin, punches him again and tells him he'll be alone forever, things start to feel a little more real. Loki then realizes he's in a time loop, and he tries to talk his way out of the situation by revealing the truth to Sif: she's a reconstruction of a past event created by the TVA. He asks her to trust him and help him escape -- an offer she appears to consider before kneeing Loki in the groin again and calling him pathetic.
However, beyond being a way to bring back a long-forgotten MCU character, Loki cutting Sif's hair to amuse himself is a reference to his role in the myth "The Creation of Thor's Hammer." In Norse Mythology, Sif isn't as defined a character as her Marvel Comics' counterpart. Beyond being Thor's wife, one of the few things known about her is that she had beautiful golden hair. That meant that when Loki cut it as a prank, Thor became enraged, causing him to threaten to break every bone in his brother's body.
Loki was able to talk his way out of a beating by promising to go to Svartalfheim, home of the master craftsmen dwarves, and procure an even more beautiful head of hair for Sif. Thor agreed, and Loki came through with not only a new head of hair for Sif but also a deadly spear and a perfect ship. But instead of returning to Asgard, Loki remained in Svartalfheim to cause mischief with the dwarves, which led to the creation of Mjolnir.
The MCU's Sif is less known for her hair than her prowess as a warrior. And with that being the case, unlike Thor in the myth, she didn't just threaten Loki with bodily harm; she delivered. But Sif's words may have bruised Loki more than her blows. She ends every encounter by telling him the God of Mischief he deserves to be alone, which is he's been grappling with. He only recently found out his mother died and was separated from Sylvie just as they were making a genuine connection, leaving him without anyone to turn to outside of Mobius, who's working for his captors.
In his final encounter with Sif, a worn-down Loki admits that Sif is right about him being a horrible person. He apologizes, acknowledging that he craves attention because he's a narcissist who's scared of being alone. Sif offers the kneeling Loki her hand before telling him that he is alone and always will be one last time. After she makes her exit, Mobius arrives to bring a battered Loki in for his interrogation.
Sif's cameo allows Loki's writers to reintroduce the Asgardian warrior, while also referencing Norse Mythology. Her scathing insults reflect the struggle Loki's going through beyond trying to stay one step ahead of the TVA and his attempt to come to terms with who he really is. Whether Loki can change has been a central question in the comics for years, and it could be as important to the show's resolution as his battle with the TVA.
Created by Michael Waldron and directed by Kate Herron, Loki stars Tom Hiddleston as Loki, Owen Wilson as Mobius M. Mobius, Gugu Mbatha-Raw as Ravonna Renslayer, Wunmi Mosaku as Hunter B-15, Tara Strong as Miss Minutes, Eugene Cordero as Casey, Sasha Lane as Hunter C-20 and Sophia Di Martino as Sylvie, with Richard E. Grant and Jack Veal. New episodes premiere Wednesdays on Disney+.