The Blacklist's James Spader will soon appear as The Avengers: Age of Ultron's big bad, and the actor's work is already drawing praise from his impressed costars.

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Writer/director Joss Whedon put together an unusually large cast for Marvel Studio's Phase Two capstone, but it sounds like Spader's performance as Ultron will be the defining point.

"It's awesome. Someone new brings a whole different dynamic to it. He's just so smart, and so impressive, and kind of unsettling as this character," said Chris Hemsworth (Thor), according to MTV. "All of us were standing on set and watching him do his scene the first day and started applauding at the end of it because it was so good. It's amazing."

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As the Avengers suit up to face Tony Starks' misguided science project, the baddie could threaten to tear the vulnerable team apart.

"The first film, no matter how big the battle got, was about the team coming together," Hemsworth said according to MTV. "This is about that team now being threatened, and do they stay together or split up, and where do they all stand?"

Find out more when the Avengers: Age of Ultron hits theaters on May 1. See a teaser below.

Tags: The Avengers 2 Avengers: Age of Ultron Movies Marvel