Let the guessing begin, folks – who could he be? Nitro? Speedball?
Sebastian Stan is definitely back as Winter Soldier, with no definite confirmation on Frank Grillo’s Crossbones as yet. And yet given the storyline in question, you’d have to assume Tony Stark is the primary antagonist.
Does this mean there’s a secret puppet-master behind it all in the movie version? Baron Zemo, maybe?
UPDATE: Now The Wrap says his character may appear in Dr. Strange as well. The plot thickens.