早已年过半百的里根·汤姆森（迈克尔·基顿 Michael Keaton 饰）曾经是一名风光一时的好莱坞电影明星，他所塑造的超级英雄飞鸟侠家喻户晓。而今荣耀早成明日黄花，不甘寂寞的里根转战百老汇，试图通过改编雷蒙德•卡佛的《当我们谈论爱情的时候，我们谈论什么》重新赢得关注 与尊重。无奈现实总和理想有太大的差距，剧组经费吃紧，糟糕的男主角被灯砸头，刚从戒毒所出来的女儿萨米（艾玛·斯通 Emma Stone 饰），毒舌戏剧评论员箭在弦上蓄势待发，此外请来救场的好莱坞当红小生麦克·珊农（爱德华·诺顿 Edward Norton 饰）乖戾张扬，屡屡染指篡改里根殚精竭虑打造的戏剧。 　　在混乱的鼓点中，命运多舛的戏剧迎来了公演的重要时刻……Actor Riggan Thomson is most famous for his movie role from over twenty years ago of the comic book superhero Birdman in the blockbuster movie of the same name and its two equally popular sequels. His association with the role took over his life, where Birdman is more renowned than "Riggan Thomson" the actor. Now past middle age, Riggan is trying to establish himself as a true artist by writing, directing, starring in and co-producing with his best friend Jake what is his Broadway debut, an adaptation of Raymond Carver's story, What We Talk About When We Talk About Love. He is staking his name, what little artistic reputation that comes with that name and his life savings on the project, and as such will do anything needed to make the play a success. As he and Jake go through the process of the previews toward opening night, Riggan runs into several issues: needing to find a replacement for the integral supporting male role the night before the first preview; hiring the talented Broadway name, Mike Shiner, for that role, Mike who ends up being difficult to work with and who may end up overshadowing Riggan in the play; having to deal potentially with a lawsuit based on one of his actions to ensure success; needing to be there for his daughter, Sam, who he has hired to be his production assistant and who has just come out of drug rehab; and pleasing the New York Times critic, Tabitha Dickinson, who wants to use any excuse to give the play a scathing review which in turn would close the show after the opening night performance. But Riggan's biggest problem may be his own insecurities, which are manifested by him constantly hearing what he believes to be the truth from the voice of his Birdman character, who he often battles both internally and externally.