The actor reprised his role as Tony Stark/Iron Man to star in last year's (12) superhero blockbuster, which became the highest-grossing film globally in 2012, and now he has agreed to return for the upcoming second and third installments.
The news was announced by Marvel Studios bosses on Thursday (20Jun13), but there was notably no mention of an Iron Man 4.
Downey, Jr. tasted further success with the comic book franchise this year (13) as Iron Man 3 sailed past $1 billion in global ticket sales to become the second most successful superhero movie of all time - after The Avengers - but there is still no confirmation whether there will be a fourth film.
The Hollywood star recently joked about reaching out to fans to fund Iron Man 4, joking, "(My) buddies told me there was a Kickstarter thing and so if you wanna see a sequel please go to Kickstarter.com and put in your vote."
His quip comes on the back of successful crowdsourcing projects by filmmakers like Zach Braff and Rob Thomas, who have managed to raise the cash needed for their film projects this year (13).
The Avengers 2 is expected to hit theatres in 2015 and will see Downey, Jr. reteam with the likes of Mark Ruffalo as Dr. Bruce Banner/The Hulk, Chris Hemsworth as Thor and Chris Evans as Captain America.