Today, Marvel officially announced that actors Elizabeth Olsen and Aaron Taylor-Johnson will be joining the cast of  Avengers: Age of Ultron. They’ll be playing the brother-sister duo of Quicksilver and Scarlet Witch. The movie hits theaters May 1, 2015. The two characters are the son and daughter of Magneto who is over in the “X” movie universe controlled by Fox. Both started as villains, but went on to become heroes, though crossed the lines between good and bad numerous times.

Taylor-Johnson is no stranger to comic book character roles as he played Dave Lizewski in the Kick-Ass franchise, which is published by Marvel’s Icon brand. Olsen has earned praise for her numerous roles and next appears in Spike Lee’s Oldboy opening this weekend. Taylor-Johnson and Olsen will share the screen as leads in the highly anticipated Godzilla remake scheduled for a May 2014 release.

Joss Whedon will return to direct Avengers: Age of Ultron, the sequel to the 2012 Marvel’s The Avengers which earned $1.5 billion worldwide.