Surprisingly, this CGI re-imagining of the cheesy 1981 kids film is rather faithful to the original. Perseus (Avatar's Sam Worthington) still rides a Pegasus, beheads Medusa and fights the towering Kraken. Most of the sequences are actually quite fun. If only the film weren't so dark and grungy, or so filled with surly characters. A little color and a bit more humor would have gone a long way here. 118 minutes PG-13.