Heroes face off in new trailer for "Captain America: Civil War"

You've heard of heroes vs. villains, but how about when superheroes turn on each other?

That's the premise behind the upcoming movie, "Captain America: Civil War."

Captain America and Iron Man are back, but this time, they're turning on each other. The first official trailer aired on "Jimmy Kimmel Live" on Tuesday, and it shows that the Avengers are not getting along, especially Tony Stark and Steve Rogers.

A scene in the trailer shows Captain America and the Winter Soldier beat up Iron Man, a.k.a. Tony Stark. Captain America, played by Chris Evans, says, "I'm sorry Tony. You know I wouldn't do this if I had any other choice. But he's my friend," before he doles out the beating.

Sadly, Tony Stark, portrayed by Robert Downey Jr., responds, "So was I."

Watch the trailer below, and tell us: Whose side are you on?