PHILADELPHIA — Near the end of the hit film "Avatar," the villain snarls at the hero, "How does it feel to betray your own race?" Both men are white — although the hero is inhabiting a blue-skinned, 2.75-meter-tall, long-tailed alien.

Strange as it may seem for a film that pits greedy, immoral humans against noble denizens of a faraway moon, "Avatar" is being criticized by a small but vocal group of people who allege it contains racist themes — the white hero once again saving the primitive natives.

Since the film opened to widespread critical acclaim three weeks ago, hundreds of blog posts, newspaper articles, tweets and YouTube videos have made claims such as that the film is "a fantasy about race told from the point of view of white people" and reinforces "the white Messiah fable."