Last week, Marvel finally unveiled the official title for the first of the studio's next two Avengers movies, Avengers: Infinity War. The next movie, previously entitled Avengers: Infinity War Part 2, has now been called Untitled Avengers, but its release date of May 3, 2019 remains the same. During Comic-Con, writers Christopher Markus and Stephen McFeely shed some light on the writing process for both of these movies.

Marvel's Kevin Feige unveiled the two-part Infinity War title back at a special Marvel press event in the fall of 2014. More recently, directors Anthony Russo and Joe Russo teased that there would be a new title, and a report from last April revealed that filming will begin in late 2016, with both movies shooting back to-back over a nine-month stretch. Yahoo! Movies held a Facebook Live interview with writers Christopher Markus and Stephen McFeely at Comic-Con, where he explained how much far along on the scripts they are. Here's what Stephen McFeely had to say about how far they are on the scripting process.

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"We're many drafts in. We're on the third draft of movie one and the second draft of movie two. [We're writing them in tandem] as much as we can. On any given day, you're only working on one but that doesn't mean that next week, you aren't working on the other one. And certainly, notes are coming in and all sorts of production stuff is coming in, like for instance, 'that thing over there is now a window not a door so adjust that.' Or, 'we're not going to this town now, we're going to this town.' That kind of stuff happens constantly and will continue to happen for the next few months."

Earlier this year, directors Anthony Russo and Joe Russo teased that there will be upwards of 67 characters in Infinity War, although they later clarified that wasn't the exact character count. Still, it is believed that this movie will feature practically every character who is still alive in the Marvel Cinematic Universe. The writers revealed that they have a huge board filled with characters who are still alive, and they're trying to figure out what characters should be included in this movie.

"When we lock ourselves in a room with the Russo brothers and a couple of execs from Marvel, one wall has cards for movie one and the other wall has cards for movie two and another wall has little baseball cards of every character still alive in the Marvel universe - down to Darcy's boyfriend in Thor 2 - literally, anybody who did not die and has been established as alive. And then we looked at that began to shuffle the cards around. So basically, the big scene is when Darcy's boyfriend and Galactus get together and....[laughs]."

The writers also clarified that the Galactus mention was a joke, so don't expect that character to show up in these upcoming movies. With filming to start at the end of this year, hopefully we'll get some confirmed story details and a full character list in the near future. Until then, take a look at the full video interview with Avengers: Infinity War writers Christopher Markuks and Stephen McFeely below.