There have been many different Batman live-action movies over the years, but the man to first put on the cape and cowl of the Dark Knight was Michael Keaton in the 1989 film, also returning to the character in 1992's Batman Returns.
“They should do this as a live-action movie today,” Smith told Marc Bernardin on his Fatman on Batman podcast when reminded that 2019 marks the 20th anniversary of Batman Beyond's debut. “What you just witnessed was my c** face. That would be f****** amazing. Could you imagine? Oh my God…that movie makes a billion, right there man. If you’re like Michael Keaton’s coming back, people like ‘how is that possible’ and you’re like ‘because he’s Batman Beyond B****’ and people are ‘oh f*** we wanted this our whole lives!’ This is f****** good and I am down with this. When can we go?”
Batman Beyond first aired on January 10, 1999, and featured an elderly Bruce Wayne passing the Batman mantle to Terry McGinnis in the year 2039. However, 2019 is an important year in Batman Beyond continuity as its the year when Bruce retired from being the Caped Crusader after almost using a gun on a criminal, which would break his number one rule of crimefighting.
(via We Got This Covered)