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Spoiler alert: Indy lives, and the villainess meets the same face-imploding fate as most of Indy's nemeses do.
The lesson here, kids, is to pay attention to how you feel, and not ask too many questions. That may be a dubious life lesson, but it's a perfect primer on how to enjoy Indy 4--and, really, any of Steven Spielberg's movies. Indy 4 delivers the chills, thrills, and spills, and if you were looking for anything else, well, you were at the wrong movie.
Right off the bat, Indy 4 tests our suspension of disbelief as a psychic, dominatrix-esque KGB agent (Cate Blanchett, who almost maintains a Ukrainian accent) forces Indy to show her where an alien is buried in Area 51. If you can go along with this, you'll enjoy the movie just fine.
Really, though, Indy 4 is no more or less ridiculous than any of its predecessors; it's just less steeped in the Judeo-Christian tradition. But if you can accept an ark that makes an army invincible, or a chalice that grants eternal life, you should be able to accept this.
In addition to eschewing traditional religious iconography, this installment of the Indiana Jones saga also finds itself in 1957, several years after the original 3 (hence KGB as the token baddies, rather than Nazis). A significantly older Dr. Jones gets roped back into the action when a young greaser named Mutt (Shia LaBeouf) tells Indy that his old archeology buddy, Professor "Ox" Oxley (John Hurt), and Mutt's mom are in trouble down in South America. There's a map, there's eluding some KGB agents, there's a few flights, there's a tomb raiding (featuring ninja aborigines), there's more eluding KGB agents, and so on.
Actually, the best bits of the film are these early scenes between Indy and Mutt: Mutt's growing appreciation of Indy's prodigious abilities remind us how impressive even the very basic of Indy's skills are--skills such as not quivering in fear while spelunking in a very creepy grave.
And, really, it's myth of Indiana Jones the man--more than the contrivances of plot that he finds himself in--that keep audiences coming back. The wide-ranging knowledge of all sorts of arcane information, the resourcefulness, the fighting skills, the ability to tolerate an absurd amount of pain, the strong moral compass, the unflappability in any situation--like James Bond, he's a projection of an idealized male. And that, for some reason, is something audiences want to see.
And that's why we don't get too upset when he does things that no human should be able to do (like surviving a nuclear blast, as he does in this film). This isn't about what life is like; this is about what life could be like, if you're willing to dream just a little bit. That's what the Indiana Jones saga has always been about, and--unless you have an allergic reaction to CGI--this installment delivers on that promise just as well as any of the others have. It won't change your life, it won't teach you much about history, it won't speak any deep intellectual truths, but it will give you two hours of healthy hero worship and a good shot of adrenaline. In my book, that's worth a 10.