Reunited with Thor, Sif accompanies him into battle against many of his most formidable enemies including Ulik, the Enchanters Three, the Circus of Crime, Wrecker, Mangog, Pluto and Surtur. Sif is part of the resistance when Loki takes control of Asgard. After Hogun the Grim attempts a physical attack, Sif puts herself in the line of fire and convinces Loki if he dies, he would have to kill her too. Loki declines to murder anyone at that point. Sif is one of the Asgardians who encounter Tana Nile, leading to a series of adventures with her that gets them exiled from Asgard for a time, but they eventually return home. Sif discovers that Thor still has feelings for Jane Foster when she finds him at her hospital bedside after Jane has been critically injured. Despite this, Sif chooses to save Jane's life by merging her life force with her own. Sif does this partially to try to understand Thor's attraction to mortals, especially Jane. Sif is soon separated from Jane, and Jane is exiled to a pocket dimension only accessible through the Possessor's runestaff. Eventually, Sif and Thor rescue Jane and reunite her with her mortal love, Dr. Kevin Kincaid. Red Norvell, who is attracted to Sif, kidnaps her when he gains Thor's power (thanks to Loki). She convinces him to return and save Asgard from Ragnarök. Later, she breaks a deadlock of votes, allowing Thor to return to Earth.