'Avengers: Infinity War' Cast on Why They'll Be Lifelong Friends

Tom Hiddleston, Mark Ruffalo, Danai Gurira, Chadwick Boseman, Winston Duke, Benedict Cumberbatch, Tom Holland, Sebastian Stan, and Anthony Mackie explain why some of their superhero castmates will still be playing co-starring roles in their lives even long after their Marvel Cinematic Universe ride is over.