Anthony Mackie and Harrison Ford butt heads in "Captain America: Brave New World," a return to Marvel's grounded political thriller roots.

Anthony Mackie stopped by the AMC theater at Disney Springs inside Walt Disney World to drop in on an audience getting ready to watch his first big-screen performance as the new Captain America. The fun and exciting moment was captured in a video that was posted to Instagram.

The spoiler-free set-up: Mackie’s character, a military veteran, counselor and former “Avengers” sidekick named Sam Wilson, has traded in his Falcon alter-ego (and his deep reservations) to finally accept the Captain America mantle.