With Comic-Con International: San Diego only a month away, advertisements have already started to appear around the city including a wraparound ad for Agents of S.H.I.E.L.D. on the side of the San Diego light rail featuring a set of flaming chains.
Those who watch the show will recgonize this as a weapon of choice for the flaming Inhuman known as Hellfire, who may be headed for an increased role in Agents of S.H.I.E.L.D.'s fourth season. But there's another (slim) possibility as well.
Could the flaming chains - on the side of a vehicle, no less - be promoting an appearance by some version of Ghost Rider? It seems unlikely that Agents of S.H.I.E.L.D. would have two characters who wield flaming chains, but Marvel did reacquire the film and TV rights to Ghost Rider back in 2013. Adding the Spirit of Vengeance to the show could light a fire (pun intended) under its early ratings in the upcoming fourth season.