It used to be much simpler to make a superhero movie. Just take a beloved comic book protagonist, pit them against one of their greatest foes, throw in some emotional turmoil, occasionally some set-up for a sequel, and voila! Easy recipe. Then in 2008, Marvel changed the game with their shared cinematic universe, but in recent years, it's also become apparent that Marvel has subtly been moving away from the standard solo movie formula and been playing around with "team-up" scenarios, i.e. when another major Marvel hero has a significant, but not necessarily leading, role in another hero's movie.