"Iron Man" 4 with Robert Downey, Jr. in the lead role is high on the demand list of Marvel Studios' fans. The clamor gets louder as the studio leaves its next three movies still without titles.

The "Iron Man" franchise where Robert Downey, Jr. played industrialist and billionaire playboy Tony Stark is the first movie in the Marvel Cinematic Universe. It is also a critically and commercially successful film directed by Jon Favreau, who is now busy as director of "Lion King."

"Iron Man" has continued to tickle the imagination of fans from the time the first film was shown in 2008, and the sequels in 2010 and 2013. Fans of the movie, who have always equated Tony Stark with Robert Downey, Jr., are worried he would not reprise his role in the fourth installment.

Marvel Studios has not confirmed if it will produce "Iron Man" 4, according to Ecumenical News. The studio is, however, hounded by rumors that it does not see eye to eye with Robert Downey, Jr. when it comes to the latter's talent fee. This gave rise to doubts if the movie will still have the same Tony Starks if it will have a fourth installment.

There are reports that Marvel Studios has several movies in the pipeline and one is reportedly "Iron Man" 4 with a 2020 release date. It will reportedly still have Robert Downey, Jr. in the lead role, but it will be the last time he will play the quirky superhero.

There are reports that Robert Downey, Jr., who will turn 52 this April, is getting too old for the "Iron Man" role. There are claims that Riri Williams, another iron-clad superhero from Marvel, will replace the Tony Starks movie. The superhero will reportedly have Disney's Skai Jackson in a role that will seen be known as Iron Heart.

Will "Iron Man" 4 be the same without Robert Downey, Jr. in the title role? Fans would disagree, considering that Downey was responsible for introducing the iron-clad superhero to the world, according to Christian Post.

Marvel Studios has not confirmed anything yet, but fans will still be able to see Robert Downey Jr. as "Iron Man" in several Marvel Studios movies namely "Spider-Man: Homecoming" in July this year and two "Avengers" movies in the next years