Agent Peggy Carter is a definite fan favorite to a lot of Marvel fanboys, and though we saw Peggy pass away in Captain America: Civil War, some have been lead to believe that Agent Carter will be making an appearance in the upcoming Avengers: Infinity War.
Uproxx points out a special montage that Marvel had put together for their SDCC panel, and when the video focuses on the Time Stone, there's a voiceover that says "Time can fix anything," and we have a shot of Steve Rogers talking to old Peggy Carter before she morphs back into her younger self.
I can totally see Peggy Carter's resurrection as some kind of leverage that Thanos can use on Steve Rogers should he wish him to bend the knee. To be honest, I'm really not a fan of the whole romance with Sharon Carter. I mean, the guy made out with your grandma, Sharon. Find someone who literally doesn't prefer your grandma over you.
Then again, Peggy has made appearances in movies whenever she can. She appeared in a flashback in Age of Ultron and Ant-Man, and she's also been a presence in every Captain America movie.
Despite the show getting cancelled, I think Agent Carter is just so much fun, and hopefully we still get to see more of her adventures in the MCU.
Avengers: Infinity War comes out May 4, 2018.