The writers were unaware at the time that Downey Jr had signed on to play Dr Doom, which they believed was why he turned it down Robert Downey Jr was offered a cameo in Deadpool and Wolverine but turned it down. The film’s writers, Rhett Reese and Paul Wernick revealed in an interview with IndieWire that they attempted to have Downey Jr return to the Marvel franchise to cameo as Tony Stark/Iron Man. It was later announced that he would be making a surprise return to the franchise to play Dr Doom , one of its biggest villains, in the forthcoming Avengers: Doomsday.

Reese and Wernick were unaware that this was in the pipeline. The scene they wanted Downey Jr was near the beginning of the film. Deadpool (Ryan Reynolds) used Cable’s time machine to jump over to The Sacred Timeline in order to try and become one of the Avengers.

Deadpool has a meeting with Happy Hogan (Jon Favreau), who rejects him because he is too self-centered for the Avengers. The writers wanted Downey Jr in the room for that scene, but kept it as it still worked without him. “Ryan Reynolds wrote the scene with both of them, so in the hopes we could get Downey,” Reese said.

“But he also wanted Favreau, because they’re a great combo, and they were all in the scene together.” “Behind the scenes, we didn’t know about the Doctor Doom,” added Wernick. “And there’s no way he was going to do both.

And then we said, ‘Oh, Downey doesn’t say no to Ryan Reynolds, does he? No one says no to Rya.