"Birdman" is described as a dark comedy that follows a former actor (Keaton) — known for once playing an iconic superhero — who is putting together a Broadway play based on a Raymond Carver short story. Production is scheduled to begin in April.
Stone will play Keaton's daughter, fresh from rehab, and Watts and Norton will be actors in the play. Galifianakis will play the production's producer.
Gonzalez Inarritu co-wrote the script with Nicolas Giacobone, Alexander Dinelaris and Armando Bo, and he will also produce with Robert Graf and John Lesher.