Elizabeth Olsen has revealed that the Avengers sequel will be darker than the first film.
The 25-year-old actress will be reunited with her Godzilla co-star Aaron Taylor-Johnson for Avengers: Age Of Ultron, where they play siblings Pietro, aka Quicksilver, and Wanda, aka the Scarlet Witch, Maximoff.
"I'm a huge fan of the first and hopefully it can provide the same excitement, but add a little bit more darkness. It is a little harder than the first one," she said.
Elizabeth, who has starred in indie drama Martha Marcy May Marlene, horror Red Lights and drama Kill Your Darlings, enjoyed joining the star-studded Avengers cast on set, including Robert Downey Jr, Scarlett Johansson and Samuel L Jackson.
"It's so much fun. I'm like smiling every day, going to bed. It's such a great time," she said.
Aaron added: "It's great. It's a lot of fun."
James Spader will portray villain Ultron, alongside returning cast members Chris Hemsworth, Jeremy Renner, Mark Ruffalo and Chris Evans.
Avengers: Age Of Ultron, directed by Joss Whedon, is scheduled for release in May 2015.