There's no sense of wonder, really, just one scare after another, and the fact that the killer Van Pelt is played by the same actor who embodied Alan's snooty father adds another dark note. Young viewers who aren't nightmare-prone might be diverted a little by the computer-generated beasts, which all have a slightly livid, unreal glaze that's fitting for how lurid engravings and drawings of the late 1800s might portray exotic beasts.
But the script is weak, and Williams pretty much plays it straight as the time-displaced, long-marooned Alan. The young actors are good, but there's a heavy undercurrent of continual peril, death, and morbidity, with no breathing room. The ending, in which history is rewritten for all the characters even better than It's a Wonderful Life, seems a little forced, to say the least, and doesn't dispel the general unpleasantness.