Two yuppie techno-geeks dismantle household appliances in a garage and, in doing so, invent a time machine. But their friendship doesn't stand the test of, well, time in writer-director-actor Carruth's cerebral thriller. With its Kubrickian cool detachment, the puzzler demands patience from even the most science-savvy viewer. Yet its profound understanding of power's corruption transcends the more immediate perplexities. EXTRAS In the commentary, the cast and crew express the brotherly love inherent in this shoestring production. Carruth's chat hits the sci-fi nitty-gritty, but the filmmaker virtually refuses to hold our hands in the dark. It seems the key to unlocking Primer is abandoning any attempt to solve the cinematic Rubik's Cube, and simply reveling in the inspired indie filmmaking.