Robert Downey Jr says there are no plans for a fourth 'Iron Man' movie.

The 'Sherlock Holmes' actor - who stars as the superhero in the eponymous franchise as well as the 'Avengers' movie series - admitted there is nothing in the pipeline for Tony Stark's solo adventures following the release of 'Iron Man 3' last year.

He told Variety.com at the Toronto Film Festival: ''There isn't one in the pipe. No, there's no plan for a fourth Iron Man.''

However, the 49-year-old actor will reprise the character in the upcoming Marvel blockbuster 'Avengers: Age of Ultron', which is set for release on April 24 2015, and has already signed up for the third comic book superhero team-up.

Robert also revealed that his future as the character is out of his hands.

When asked if he would mind another actor taking over the role, he joked: ''I like that the idea is that it would be up to me, like I'm casting director for Marvel.''

Meanwhile, Robert's latest offering 'The Judge' - in which he co-stars with Robert Duvall and 'Gossip Girl' actress Leighton Meester - recently premiered in Toronto and is set for UK release on October 17.

Iron Man 4 would have probably had MODOK and the rest of AIM or the Crimson Dynamo robots.