8) “Thor” Returns
At the time the Civil War comic book took place, Thor was believed to be dead. That’s what made his return so shocking, but after he lost control and brutally murdered a member of Team Cap, it was revealed that this wasn’t the actual God of Thunder.
Instead, it was a part clone, part cyborg hybrid which had been created by Tony Stark, Hank Pym and Reed Richards using a hair Iron Man had swiped the first time he met Thor.
Tony turning one of his closest allies into a weapon was a pretty despicable act, and when the real deal returned, he wasted no time in kicking Iron Man’s ass. Setting up something similar in Captain America: Civil War would have been a lot of fun to see and would have had a great payoff down the line.