BBC Earth Films produced this computer-animated feature, an expansion of its 1999 TV series. More educational than your average big-screen family entertainment, it provides a lesson in prehistoric geography and the behavior of dinosaurs from the Cretaceous period. Unfortunately the filmmakers must have been worried that the science lesson, though perfectly engaging on a visual level, would bore small children, so the movie is stuffed with glib, unfunny wisecracks along the lines of Shrek. Barry Cook and Neil Nightingale directed.