Short trailer that really doesn't tell very much, unfortunately, however, this is just one of the things that I never really can get let go off. According to Chris Carter and Frank Spotnitz, this movie is "only" a PG-13 rated movie - it's an intense thriller, but isn't to be considered as a horror movie.
While the first one kinda did disappoint me, it was still... X-FILES. Scully and Mulder has just grown as a major part of me. Gonna own all seasons on DVD some day!
IGN Video: The X-Files: I Want to Believe Movie Trailer - Debut Trailer
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"You're not your job. You're not how much money you have in the bank. You're not the car you drive. You're not the contents of your wallet. You're not your ****ing khakis. You're the all-singing, all-dancing crap of the world. "