Captain America and Black Widow #636

Francesco Francavilla's cover for this 2012 Marvel team-up sets a tense, espionage-charged tone: Black Widow stands front and center in her black tactical suit, assault rifle in hand, with Captain America's blood-spattered shield looming behind her as a grim backdrop. Towering above it all is a masked figure whose single, ominous eye peers down over the scene, suggesting serious danger closing in on our heroes. Cullen Bunn and Francavilla make a compelling creative pairing, and this moody, noir-inflected issue looks like a strong entry in their run together.