Actor Robert Downey Jr. is reportedly set to reprise his "Iron Man" role in the upcoming "Captain America 3".

The Oscar nominee is in final negotiations to bring billionaire Tony Stark and his superhero alter ego to the big screen once again for the third installment of the franchise, reports variety.com.

Downey Jr. has recently kept fans guessing to whether there will be a fourth film in the franchise. He has already suited up for "The Avengers: Age of Ultron" and `The Avengers 3.`

"Captain America 3" is slated to begin production next spring with the film hitting cinemas in May, 2016.