Hollywood actress Scarlett Johansson was left exhausted and afraid of getting overheated on the sets of her upcoming movie Iron Man 2 because the catsuit she had to wear was too hot.

The actress who plays Natasha Romanoff and her alter-ego, Russian spy Black Widow, in the new superhero movie had no qualms wearing the skin-tight outfit, but was worried she would overheat while filming fight scenes.

"The first time I saw the suit I just thought, 'That looks like it's going to be really, really hot!' Literally - the temperature was very hot," she said.

Although Johansson struggled with the stifling temperatures inside the black catsuit, the 24-year-old blonde wants to reprise her role for another Marvel comic book adaptation.

"The Black Widow has many different incarnations and different storylines so I'm hoping she will be able to continue in that way. I'm hoping that if the fans like the character and support the character, we'll see her again," she said.

Her actor husband Ryan Reynolds is already in talks to have his own superhero spin-off movie - based around his X-Men Origins: Wolverine character Deadpool.