Who He? He broke through with Alpha Dog, impressed in Charlie Bartlett, was the best thing in Terminator Salvation as Kyle Reese, and essayed a comedy accent as Chekov in Star Trek.

Why He? The same puppy dog-esque edge he brought to Chekov could work very well as Parker, but he has the range to push himself into more action-y roles - and he's more or less the right age. Will he want another franchise to run alongside Trek, though? And is he too physically slight? (Then, so was Maguire…)