This week at the movies, we've got a strange alien world (James Cameron's Avatar, starring Sam Worthington and Zoe Saldana), and a couple on the run (em>Did You Hear about the Morgans?, starring Hugh Grant and Sarah Jessica Parker). What do the critics have to say? Avatar is one of the most hotly anticipated films in years, for a number of reasons: it marks James Cameron's return to fiction filmmaking after a long layoff; its motion capture techniques were the subject of intense pre-release press; and it's the most expensive movie ever made.