A few weeks ago, the stars of Avengers: Age of Ultron took to their respective Twitter pages to debut new character posters for this highly-anticipated Marvel Phase Two sequel, in theaters May 1. Today, the poster roll-out continues with the latest actors to join the Marvel Cinematic Universe, Aaron Taylor-Johnson as Quicksilver and Elizabeth Olsen as his sister Scarlet Witch. Since all of the main Avengers character posters have been revealed, we'll have to wait and see if Marvel brings out a poster for the villainous Ultron (James Spader) or Vision (Paul Bettany).

Avengers: Age of Ultron is the epic follow-up to the biggest Super Hero movie of all time, 2012's Marvel's The Avengers. When Tony Stark (Robert Downey Jr.) tries to jumpstart a dormant peacekeeping program, things go awry and Earth's Mightiest Heroes, including Iron Man, Captain America (Chris Evans), Thor (Chris Hemsworth), The Incredible Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson) and Hawkeye (Jeremy Renner), are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.

Joss Whedon wrote and directed Avengers: Age of Ultron, with Kevin Feige producing and Louis D'Esposito, Alan Fine, Victoria Alonso, Jeremy Latcham, Patricia Whitcher, Stan Lee and Jon Favreau serving as executive producers. Take a look at the latest character posters below, and stay tuned for more one-sheets, photos and footage as we get closer and closer to the May 1 release date.