T-Rex won't be as effective on DVD (where the IMAX 3-D effects are amusingly pointless), but it's guaranteed to please anyone who enjoyed the similarly astounding CGI effects of Walking with Dinosaurs. Stauber is a refreshingly normal teen star, and although much of the dialogue sounds like it was cribbed from a grade-school science text, its educational value is perfectly matched to the wonders of Ally's prehistoric adventure. Director Brett Leonard previously helmed the pioneering FX flick The Lawnmower Man, and here he demonstrates a warmer, more accessible sense of wonder for kids and parents alike. At 45 minutes, this IMAX dazzler never wears out its welcome. --Jeff Shannon