James Spader has revealed that playing Avengers villain Ultron will be "a lot of fun".
"I think it'll be a lot of fun and it's incredibly nostalgic for me," he told The Independent.
James, who next stars in TV series The Blacklist, admitted that starring in a superhero movie is like a childhood dream come true.
"When I was a kid my best friend had trunks of comics and I didn't have any so I used to love going for sleepovers at his house," he said.
"Also I have three sons and two of them have a great interest in comics so they're excited I'm playing the role."
The 53-year-old also revealed he has already started preparing for the Marvel baddie role.
He told Inquirer Entertainment: "Just this weekend I went in for them to take very extensive photographs, head scans, body scans, and all kinds of things in preparation for figuring out how the hell I'm gonna fit in this Ultron character!"
The Avengers: Age Of Ultron, which sees Robert Downey Jr, Chris Hemsworth, Chris Evans, Jeremy Renner, Mark Ruffalo and Scarlett Johansson reprising their superhero roles, will open in cinemas in May 2015.