It was a super hero gathering in London at the European premiere of "Marvel Avengers Assembly."

The entire cast - from Robert Downey, Jr. to Chris Hemsworth and Scarlett Johansson - walked the red carpet.

Downey, Jr., who returns as Iron Man, said there are perks to having such a large, star-studded cast.

SOUNDBITE: Robert Downey, Jr saying (English):

"When there's more people in the movie you get more days off."

Hemsworth, who resumes his character, Thor, also loved being in the company of other super hero stars.

SOUNDBITE: Chris Hemsworth saying (English):

"I much prefer it. I much prefer it to share the workload and to be surrounded by people who have a much larger fan base and talent than I do."

"Marvel Avengers Assemble" is being released in U.K. theaters on April 26 and in the U.S. under the title of "The Avengers" on May 04.

Bob Mezan, Reuters.