Robert Downey Jr. Explains ‘Captain America: Civil War’ to Very Confused David Letterman (Video)

“Who do we root for?” Letterman asks the Iron Man actor who will face off against Chris Evans in the upcoming Marvel sequel that may or may not feature Spider-Man

Last Updated: April 24, 2015 @ 10:41 AM

“Avengers: Age of Ultron” star swung by “The Late Show with David Letterman” on Thursday, but spent more time explaining the concept of a different Marvel sequel than he did promoting the one hitting theaters on May 1.

“Help me out with some things here,” Letterman said. “Not this movie — this movie is ‘Avengers: Age of Ultron’ and that’s the new film. And the next film, we think, [is] ‘Captain America.’ You’re in that one, is that correct?”

Correct.

“And you fight Captain America, is that right?” Letterman asked.

Correct.

But when RDJ — who plays Tony Stark a.k.a. Iron Man in the Marvel movie universe — explained the concept of “Captain America: Civil War” to the 68-year-old late-night host on the verge of retirement, Letterman assumed that if Star and Steve Rogers square off, they must be “evil enemies.”

Incorrect.

“You must win,” Letterman assumed. “I bet you win.”

“It’s called ‘Captain America: Civil War,'” RDJ said with a laugh, implying his patriotic peer may have the advantage.

“Is Spider-Man in there, as well?” Letterman asked.

Maybe.

“Who do we root for?” Letterman asked. “Captain America? Spider-Man? Or Iron Man?”

Watch the video to find out which superhero Iron Man thinks the audiences should be rooting for, and to see a hilariously inaccurate preview of “Age of Ultron.”