Samuel L. Jackson wants to trade places with Scarlett Johansson so he can be "that cute for 15 minutes".

The pair are part of the star-studded ensemble cast for the hotly-anticipated movie Avengers Assemble, also including Robert Downey Jr., Chris Evans, Mark Ruffalo and Chris Hemsworth.

When asked which Marvel superhero they'd like to swap places with, Samuel was quick to answer.

"I'd want to be Scarlett [Johansson]. I just want to be that cute for 15 minutes," he laughed in an interview with Collider, before Chris Evans added that Robert's character appeals to him most.

"I want to say Iron Man because I love those movies, but who can do it better? The shoes would be too big to fill," he said.

The cast have joked about their behaviour on and off set. While Chris Hemsworth maintains that the all-star cast was kept in order throughout filming, Mark has recalled a particularly bizarre encounter with co-star Scarlett.

"I keep getting asked about who was the biggest diva. This was the first time I worked with these guys, and we all are either that well-behaved, or everyone kept each other in check. No one wanted to be the one who screwed it up," Chris explained.

"I just remember going to someone's place with a group of half-naked stuntmen in a hot tub, and Scarlett Johansson standing over them with a giant ladle, making boy soup," Mark jokingly added.