The fourth episode Marvel's Agents of S.H.I.E.LD is currently shooting in Stockholm, and a set of very interesting set photos have hit the internet. They feature a group of people in suits wearing red masks and hats. I have no idea what this is all about, but it's definitely intriguing. There is speculation that these guys could be Flag Smasher's terrorist army, Ultimatum. Check out the photos and let us know what you think this could be!