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"The crystal skulls turn out to be alien skulls, underneath a Mayan or Aztec pyramid that takes off and thus reveals itself to be a mothership of sorts."
Again, sounds corny. But with Steven Spielberg directing and George Lucas producing, we may still have a gem of a crytal on our hands...
And the guys and girls in the movie are Harrison Ford (of course), Shia Lebeouf, Cate Blanchett, Jim Broadbent, Ray Winstone, John Hurt & Karen Allen. Sounds like a solid cast, hope the movie is just as solid.