Robert Downey Jr and Nathan Fillion go head-to-head over who plays the coolest character in this fantastic video to promote The Avengers and Castle.
Yeah, but can you do this?
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Cheryl Mullin - is a card-carrying sci-fi geek who says the best weekend of her life was meeting the Star Trek Next Generation cast at a convention. She also loves geeks so much, she married one.
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A geek's guide to the world of science fiction TV, films, books, comics and action figures - and any other cool stuff too