As usual, the adaptation adds a woman--orphaned jungle girl Elaine Cassidy--to the expedition, and an interesting villain (religious fanatic Peter Falk) beefs up the travelogue by marooning Challenger's gang on the South American plateau where dinosaurs, cavemen and Indians coexist eventfully. The Walking with Dinosaurs-style effects work well for the TV frame, but the real success is in integrating the Boys' Own adventuring with subtle eco-awareness, complex character interplay and the reliable wonder of soaring Pteranodons and Carnosaur attacks. --Kim Newman