'Iron Man' sequel coming in 3D?

The sequel to last summer's blockbuster Iron Man may be released in 3D.

According to Ain't It Cool News, Paramount and Marvel have produced a one-minute demo real that shows footage from Iron Man 2 converted to digital 3D.

Producers are reportedly evaluating the time needed and cost demands to turn the entire film into 3D, with three different companies in the running for the conversion job.

Iron Man 2, which opens next May, will see Robert Downey Jr reprising his role as the eponymous Marvel superhero. Gwyneth Paltrow and Samuel L. Jackson also return to the cast, joined by newcomers Scarlett Johansson, Mickey Rourke and Sam Rockwell.