Beginning with issue #646 (November 2012), "Journey into Mystery" by Kathryn Immonen and Valerio Schiti shifted focus from Loki to Sif. Editor Lauren Sankovitch said, "We had it Loki-centric... going forward with #646 we wanted to mix it up a little bit. Sif's been in the thick of it, she's a born warrior, she's got a lot of fight and verve and fire to her! We talked at length about what this story could be and what her story could be, and it all came down to...one single question: what does she want? I think Sif, above all, wants to be a better warrior." The series was cancelled in August 2013 with issue #655. About the cancellation, Immonen said, We are done with 655. But seeing as we were basically cooked right out of the gate, I'm going to call hanging in for nearly a year a success. To be truthful, the real challenge that we inherited with this book was living up to the beautiful work that ] et al. had done previously and the amazing reader energy that had been generated. If all that had happened with our ten issues was to extend the influence of the astonishing Valerio Schiti, that would have been enough. As it is, I'm so proud of what Valerio, Jordie Clayton [Cowles, Pepe and I put on the page under Lauren and Jake's fearless leadership. I'm also thrilled to have been able to write Sif as a fierce warrior and a lovable dork. I hope she finds a new home somewhere with a lot of things to say and a lot of things to kill.