Alien and Aliens are classic, fantastic sci-fi / horror movies. Prometheus had great potential to extend that world in a new direction but unfortunately its poor screenplay ruins any chance of that. None of the characters have any depth to them; their motivations are not explored or understood -- especially Michael Fassbender's David android, and Charlize Theron's character who hovers in the background doing nothing for most of the movie. The action is unfocused and character reactions are not believable. The overall story arc is underwhelming, as is the climax of the movie. The special effects are good, and the acting is fine. Although Guy Pearce's old age makeup is distracting -- I don't understand why filmmakers rely on that instead of simply hiring an older actor. Lastly, this *is* a prequel to Alien, and it suffers because of the filmmakers' apparent need to satisfy a checklist of references to the original. I'm sorry to say that I was quite disappointed with Prometheus.