How sweet it is to have Ridley Scott return to sci-fi genre 30 years after giving us “Blade Runner.” His “Prometheus” is a stunning movie to watch and once again reminds us of what a stylistic perfectionist he is. While it is said to be a prequel to “Alien,” it is really separate from the 1979 classic as it deals with a different set of themes and ideas. While the original “Alien” dealt with corporate greed in trying to use the creature as a weapon, “Prometheus” is far more fascinated with the origins of humanity.

Noomi Rapace, Lisbeth Salander in the Swedish version of “The Girl with The Dragon Tattoo,” stars as Elizabeth Shaw, an archaeologist who, along with her boyfriend Charlie (Logan Marshall-Green), discovers a star map in several unconnected ancient cultures on Earth. They come to interpret the map as an invitation from those who created humanity to discover the origins of life on a distant planet. A few years later they are on board the spaceship Prometheus which takes them and several engineers to that location.

When they land on the planet LV-223, not LV-426 from the first two “Alien” movies, they discover a species which appears to be extinct along with a monolithic statue of a humanoid head. In the structure they explore, they also find a large number of metal cylinders which soon start leaking black fluid. Soon after, everything goes wrong and the characters discover how their need to learn about humanity’s creators was a very big mistake.

The smartest thing Scott did with this particular prequel was to not make it the kind which ties up all the loose ends to the original movie that comes after it. This has been a big problem with prequels like “The Thing” and “X-Men Origins: Wolverine” as they get so concerned about getting the details right to where any suspense or drama gets completely drained, making for a far less effective movie going experience. “Prometheus,” however, takes place several decades before “Alien,” so the filmmakers don’t have to worry about this too much.

“Prometheus” uses the element of mystery to great effect as several characters appear to have ulterior motives they work to hide from others. Charlize Theron is especially effective as Weyland Corporation employee Meredith Vickers. Hiding discreetly in the shadows and coming off with a tough as nails attitude, she clearly has her own agenda as you would expect any member of this or any other, corporation to have.

The movie’s most fascinating character, as well as its most enigmatic, is David, an android designed to be indistinguishable from humans played by Michael Fassbender. We first see him looking over the ship while the rest of the crew is in hypersleep, and he models his behavior on Peter O’Toole’s performance from “Lawrence of Arabia.”

David is like Data from “Star Trek: The Next Generation” in that he is more human than the humans he works with. But the words of the Borg Queen from “Star Trek: First Contact” of how Data is “an imperfect being created by an imperfect being” kept echoing in my head as we see David gaining an ego to where he is fully aware of how superior he is to humans. With this ego comes a wealth of insecurities like envy and jealousy which wipe away the façade his infinitely polite behavior hides.

Idris Elba co-stars as the captain of Prometheus, Janek, who serves as the movie’s most realistic character. Sci-fi movies need a down to earth character like this because in the midst of all the technical mumbo jumbo, someone has to come out and say, “What the hell is going on?” Elba, so good on the BBC series “Luther,” is a strong addition to this cast even though I found his American accent a little weird at times. Couldn’t he have made Janek British like him? Anyway, he gives what may be seen as this movie’s most underrated performance.

But while much of the acting praise may go to Fassbender, I have to single out Rapace who gives a very strong performance as Elizabeth Shaw. Just watch her in the scene where another character yells right in her face that he wants to go back to the ship. Rapace doesn’t budge or blink at this raw anger, and she is as riveting in this movie as she is in that one scene.

Rapace also has the movie’s most unnerving scene as, upon finding that she has a “foreign organism” inside her body, gets into a robotic surgery device to have it removed. It’s a brilliantly icky scene which shakes up the audience in the same way watching Anthony Hopkins cut off a piece of Ray Liotta’s brain in “Hannibal” did. Rapace sells the scene completely and has you pinned in your seat as she goes through the kind of surgical procedure we’d rather be sedated through. On top of this, she does a practically flawless British accent which is more than I can say for many actors in American movies.

Among the other excellent performances comes from Sean Harris who plays the unhinged geologist Fitfield who never lets his mohawk hairdo upstage him, Guy Pearce who is almost unrecognizable under pounds of makeup as the CEO with a god complex Peter Weyland, Logan Marshall-Green as archeologist Charlie Holloway who goes to extremes in his work for better and for worse, and Rafe Spall as the all too friendly botanist Milburn.

“Prometheus” asks a lot of profound questions about who created us and why those same beings chose to abandon planet Earth. It deliberately doesn’t answer all of those questions, but while many consider this one of the movie’s biggest problems, I think it’s one of its many strengths. To answer all those questions would have weakened this movie tremendously and, as I said earlier, the element of mystery plays a strong part in its overall success.

There’s no real satisfying way to answer all the questions “Prometheus” presents as we have enough trouble answering them on our own. I think the movie’s main focus is on the struggle of faith as Rapace’s character thrives on it, and she spends the story seeing it severely tested. The lack of answers ends up reinforcing the faith she has in those who created human beings, and this keeps her faith from being killed off completely.

Scott gives us a visually sumptuous motion picture with extraordinary visuals and special effects which feel wonderfully unique to everything else out there. With cinematographer Dariusz Wolski, frequent music composer Marc Streitenfeld, editor Pietro Scalia, and writers Jon Spaihts and Damon Lindelof, Scott gives this movie the look and feel the only he can pull off, and it all makes his eagerly awaited return to the sci-fi genre he so brilliantly transcended with “Alien” and “Blade Runner” all the more welcome.

While “Alien” was a masterful combination of the sci-fi and horror genres, “Prometheus” is more sci-fi than horror. “Prometheus” has its thrilling moments, but Scott is not out to scare the shit out of us the way he did back in 1979. He is more cerebral with this film, and it makes you eager to see a sequel to it sooner rather than later. I don’t care what anybody says, “Prometheus” was very much worth the wait and, despite whatever flaws it may have, it had me enthralled from beginning to end.

Actually, one thing you could say about the movie is how it may give ammunition to creationists who claim human life came about through the efforts of a supernatural being. Then again, the very last scene of “Prometheus,” before the end credits roll, features a somewhat familiar-looking creature making an appearance you can’t quite see coming. With that, you can safely say the filmmakers do firmly believe in the theory of evolution.

* * * * out of * * * *