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4. Sam Worthington
While Christian Bale seemed to command attention in the media this year for his crazy-pants "Terminator" tirade, it was in fact a much lesser-known actor who got well-deserved attention for his role in "Terminator Salvation." Worthington has been up-and-coming for some time, but really broke through the A-list barrier with this film. The looks, the talent, the Australian accent -- this is what movie stars are made of, really. And now (like every other soon-to-be mega movie star, it seems), he's starring in "Avatar," as well. He's also rumored to be starring as Captain Nemo in the remake of "20,000 Leagues Under the Sea," so I have a hunch this is only the beginning with Sam. Then again, he was also quoted as saying he'd like to eventually go on "Dancing With the Stars"... so I guess we know where Sam's career is gonna end, too.