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Tony Stark and Malcom Reynolds Frank Castle on the same stage? Check out this great cross promo with Nathan Fillion and Robert Downey Jr. talking about their respective projects of The Avengers and Castle. It’s always funny to hear two big time people from geekdom interact with eachother especially when talking about their characters.

“the Avengers” is Marvels huge summer blockbuster that is coming out on May 4th in the United States. “Castle” is a series on ABC Mondays at 10:00pm.