Michael Keaton stars in new trailer for Birdman: watch now A new full-length trailer has arrived for Alejandro González Iñárritu’s black comedy, Birdman, in which Michael Keaton plays a washed-up superhero actor looking to recapture his glory days. As “Birdman”, Keaton’s character was a major movie star in days gone by, but since passing up on Birdman 4, things have pretty much dried up, career-wise.