We’ve known since Comic-Con and D23 that Ryan Reynolds and Hugh Jackman would almost certainly be returning in Avengers: Doomsday as Deadpool and Wolverine, respectively. They didn’t actually say “Hey, we’re in the movie,” but c’mon. They showed up to promote Doomsday for Marvel. Folks, they’re in the movie. But now we know the duo are also writing Doomsday as well. At least part of it, anyway. Via Variety, we’ve learned that on the WGA website, both Reynolds and Jackman are listed among the Writers Guild of America’s directory with screenwriting credits for Doomsday. It lists Reynolds and Jackman among the 10 writers who contributed to the script. Reynolds has already made a joke post about this discovery on social media.
Ryan Reynolds has writing credits on Deadpool 2 and Deadpool & Wolverine. But this marks Jackman’s first writing credit on a Marvel related movie. So what does this all actually mean for Avengers: Doomsday? It’s safe to say that both actors probably contributed to their dialogue in the film, especially any one-liners, which they are sure to have. And we expect a lot of those in this movie. And we imagine that’s about it regarding their writing involvement. Both actors tend to exert quite a bit of ownership over both characters, so both of them receiving credit makes sense.

Nerdist’s Take: Ryan Reynolds and Hugh Jackman’s Involvement in the Writing Reminds Us Doomsday Has Many Secrets Yet to Be Revealed
The main writers on Avengers: Doomsday are Marvel Studios veterans Stephen McFeely and Michael Waldron, creator of Loki. The credits for “additional literary materials (not on screen)” go to McFeely, Waldron, Eric Pearson, Chris McKenna, Erik Sommers, Jeff Loveness, and Andrew Lanham. The last writing credit goes Shang-Chi and Spider-Man: Brand New Day director Destin Daniel Cretton. If you’re wondering about his involvement, Marvel tapped him to direct the film when it was The Kang Dynasty. And some of his ideas clearly wound up in Doomsday in some form. With just a month to go, we imagine plenty of surprises remain about Doomsday.