'Avengers: Age of Ultron' drops in theaters in less than a month now, and with the influx of trailers and casting information released, one would think they would know all the big roles in the film. However, recent news would have one thinking again.

In a list of actors set to premiere on the red carpet event were actresses Julie Delpy and Linda Cardellini. There roles weren't specified, however since both actresses are fairly high profile it isn't suggested that it is some sort of small cameo.

"For a quick refresher, Julie Delpy is best known for her starring role in Richard Linklater's Before Trilogy. She also co-wrote several of those films and is now a director herself, with films like 2 Days in Paris. Linda Cardellini came into our lives as Lindsey Weir in Freaks and Geeks and has since appeared in the Scooby-Doo movies, on ER, Mad Men and much more," writes Slash Film.

There are an infinite amount of characters each actress could be portraying, and it has been confirmed by director Joss Whedon that we would encounter characters in the film that has not yet been shown in the trailers. Captain Marvel for one has been rumored to show up in the end credits for this movie. It's speculated one of these actresses could lead the role.

'Avengers: Age of Ultron' will hit theaters in a major way on May 1^st.