The role of half-human/half-machine Marcus Wright in “Terminator: Salvation” has introduced a lot of people to Sam Worthington, and he’s poised to take advantage of his new star status.  He’s already scored a part in the movie “Avatar,” which is directed by James Cameron (who, ironically, wrote and directed the first two “Terminator” movies).  Worthington’s already gotten a sneak peek at the 3-D technology Cameron is using in the film, and he’s impressed with what he’s seen. (CLICK ON THE MEDIA BAR BELOW TO HEAR SAM WORTHINGTON)