Sand. Lots of sand. That’s the big takeaway from StarGate (D), a pricey science fiction epic about an intergalactic doorway to an alternate world of phony pyramids, an androgynous pharaoh and mumbo jumbo amidst dusty dunes. Writer/director Roland Emmerich gives James Spader, Kurt Russell and Jaye Davidson little to do in a story that quickly sinks like quicksand amidst the bombast. It’s not one for the ages.