EW - Fifteen Years ago, Tom Cruise accepted his first mission as Ethan Hunt. Since then, he's dangled from a harness at CIA headquarters, scaled vertiginous rock faces, and busted into the Vatican. But the biggest accomplishment Cruise can claim has nothing to do with gee-whiz gadgets or high-wire stunts. It's how he's managed to spin a money-minting juggernaut out of such a kitschy TV show. The fourth installment, Mission: Impossible — Ghost Protocol, is set to hit IMAX theaters Dec. 16 and the rest of the civilized world on Dec. 21. With a new box set of the first three chapters now out on Blu-ray, it's worth looking back at how Hunt and his crack team of techno-nerds reinvented Hollywood espionage.