The Before Sunrise star and Mad Men and former E.R. regular Cardellini will attend The Avengers: Age of Ultron premiere, and now Disney insiders have confirmed the actresses feature in the film, but have not disclosed their roles.

They join returning Avengers stars Robert Downey, Jr., Scarlett Johansson, Chris Evans, Chris Hemsworth and Mark Ruffalo, and newcomers Paul Bettany, Aaron Taylor-Johnson and Elizabeth Olsen, while James Spader provides the voice of the villainous Ultron.