Okay, judging from the other Moon thread, enough people have seen this to actually discuss it. There will be spoilers in this thread - you have been warned... The way I figure it there are 5 Sams. Sam Bell returns home, as Sam-3 discovers when he reaches his (Sam's) daughter. She's fifteen, it's been twelve years at the station - 3 years for Sam, 2 clones (Sam-1, Sam-2) and Sam-3 has just finished his 3 years, rounding out the 12. Does Sam Bell know about the clones? This is one of the big questions that I think hovers over the film. When I first realized he got to return home, I felt relief, and then terrible despair as Sam-3 realizes he has no place at all, that he is truly just a disposable copy of a real person. He doesn't ever seem to quite grasp that the clones only have a three year life span, but the files Gerty reveals to him were a brilliant way to show this to the audience. The delineation Rockwell brings to Sam-3 and Sam-4 and the subtle writing that indicates how the three years on the station change(d) Sam was truly fantastic. Did all the Sams change in this way? The model keeps being added to, so perhaps they do. This brings up interesting existential questions. Is each of the Sams really a separate entity, or is it predetermined how their short lives will go? Do they follow the same path intrinsically, or is it because they are each placed in the exact same environment? Sam-5 destroys the jammer. Does Sam-5 then wake up to not live the illusion? Or does the repair crew thwart Sam-4's efforts? What happens to all the other clones in cold storage? I understand the next movie Jones is discussing is not actuallya sequel, but a story set in the same universe, though he says Rockwell has agreed to do a cameo in which we learn Sam-4's fate. The radio voice over questioning Sam-4's identity on a call-in show was brilliant. Whew - I've been dying to get those observations and questions out for ages!! One of the great strengths of this movie is the number of questions it provokes.