Earlier today, we reported that the Infinity War team is planning to create a film that is the culmination of the entire Marvel Cinematic Universe. The seeds that have been planted throughout all the movies and TV Shows will come together in this epic 2-Part movie event. And the duty of pulling all of those details together into two cohesive films is left to Christopher Markus and Stephen McFeely, the fantastic screenwriting duo.

Markus and McFeely have written a significant portion of the MCU. They wrote all of the Captain America movies, helped with Thor: The Dark World, and created Agent Carter for television. It’s a good thing that they live and breath the MCU, because they are going to need all of that knowledge to bring together Infinity War.

Collider spoke with Markus and McFeely about their writing process, which is almost at the end of the first draft of both scripts, due at the end of April.

STEPHEN MCFEELY: We got back from Atlanta after spending all of our off-time in Atlanta brainstorming, and then got back to Atlanta and spent the last four months of the year in a room, sometimes with the Russo Brothers, and almost always Jeremy Latcham, who was on all of the Avengers movies, and Nate Moore, who was our guy on Winter Soldier and Civil War, and just brainstorm, brainstorm, brainstorm. It looks like a serial killer’s lair with all of the cards and stuff on the walls.

CHRISTOPHER MARKUS: And gradually it begins to take shape, and gradually one thing becomes a story. Now how we can we surprise people? People know the villain. People know the stones and stuff, so it is a little more known than the other movies we’ve done.

MCFEELY: We’re starting a little less from scratch.

MARKUS: But then what do you do with all of that? How much acid are we expecting the audience to take?

MCFEELY: But just how Winter Soldier is not Winter Soldier, and Civil War is not Civil War. They’re not direct interpretations. We take the best ingredients and make a different little meal out it.

Infinity War will not premiere until 2018, so Markus and McFeely are working in an universe that we can still only imagine. How weird will the MCU be at that point?

MARKUS: This is weird, what we’re writing now. It will be less weird a year from now or two years from now because the audience will have seen a few different things.

MCFEELY: In the vaguest possible way we have no limits. Limits come with budget and schedule and people going “That’s a bridge too far,” but at the moment anything we have the rights to is possible, and that’s the appeal of this project and the MCU is we can pluck as needed from the comics and from the movies. Like William Hurt—we need someone who represents the government and has a grudge against superheroes and we need this character anyway. Oh! It’s one of the greatest actors in history! Let’s get him!

With directors Joe and Anthony Russo returning to make their plans into reality, I have no doubt that Infinity War will be a masterpiece for the MCU. Right now, I envy any fly on the wall of the offices of Markus and McFeely as they put it all together. For the rest of us, we have to wait until Avengers: Infinity War – Part 1 premiers on May 4, 2018, followed by Avengers: Infinity War – Part 2 on May 3, 2019.

Source: Collider