The Dracula actor joins newcomers Elizabeth Olsen, Aaron Taylor-Johnson and James Spader -- who will play Ultron, the main villain -- in the second installment of The Avengers saga. The film will follow The Avengers as they "reassemble to battle the sentient robot known as Ultron."
Whedon is writing and directing the sequel which reunites most of the cast from his 2012 box office hit, The Avengers.
Age of Ultron is scheduled to hit theaters on May 1, 2015.
Jessica Simpson shares three-way kiss with friends in photo
Senate Democrats to pull all-nighter on climate change