Robert Downey Jr has signed up for two more Avengers films, it was revealed yesterday (June 20).

Marvel Studios announced that the lucrative star will reprise his role as billionaire Tony Stark/Iron Man in both The Avengers 2 and The Avengers 3.

Downey Jr starred in both 2012's superhero blockbuster The Avengers and this year's Iron Man 3.

Joss Whedon is returning to write and direct the sequel to The Avengers, after the runaway success of the first film, which has grossed $1.5 billion worldwide to date.

The sequel, which will feature a combination of returning characters and the introduction of new Marvel faces, is slated to begin production in March 2014 and with a scheduled May 1, 2015 release date.

Fellow cast members Chris Hemsworth as Thor, Chris Evans as Captain America, Mark Ruffalo as the Hulk and Jeremy Renner as Hawkeye are also expected to return.