Showrunners Tara Butters and Michele Fazekas told Comic Book Resources that the concept of "Darkforce" will be used as a narrative arc in the second season to tie the series into both Doctor Strange and Agents of SHIELD.
In the comics, the "Darkforce" is an unidentifiable entity that played a part in the creation of various superheroes and villains.
Essentially, Carter will travel to Los Angeles to investigate a company called Isodyne Energy and the weapons of mass destruction it's working on. Through her investigation, she stumbles upon the "Darkforce" and spends quite some time trying to figure out what the mysterious extra-dimensional energy is.
"That's our tie-in to the Doctor Strange universe, and also to SHIELD because you've seen it in SHIELD as well," Fazekas told the website.
In the first season of Agents of SHIELD, the energy force was used to power one of the show's more memorable villains, Blackout. Although, Fazekas was quick to point out that because the "Darkforce" affects every character differently, the way it presents itself in Agent Carter will be much different than how people first saw it work in Agents of SHIELD.
"The cool thing about what we learned as we researched Darkforce over the course of Marvel comic book history is, it affects people in different ways," Fazekas said. "We were able to select what we liked and sort of make our own rules as to what it does, how it operates, and who it affects in our world."
Neither Fazekas nor Butters alluded to whether characters from the upcoming Doctor Strange would find themselves in the show's second season, but it seems pretty unlikely.
The two-hour premiere for Agent Carter's second season happens Jan. 19 at 9 p.m. ET on ABC.