2/5 Not as good as the BBC series
  by D. J. Nardi (Washington, DC)
I got this because I loved the BBC series Walking with Dinosaurs. However, National Geographic: Sea Monsters - A Prehistoric Adventure (In 3-D) [Blu-ray] isn't quite as good as that series. Rather, it features clips of paleontologists digging for fossils, with scenes of the CG sea monsters interspliced. As such, it isn't as entertaining or exciting as the BBC series, which shows just the dinosaurs. If you want a great series on prehistoric sea monsters, check out BBC's Chased By Dinosaurs, which in addition to dinosaurs has a mini-series featuring sea monsters that is much longer than National Geographic: Sea Monsters - A Prehistoric Adventure (In 3-D) [Blu-ray]. In the series, Nigel Marvin chases, and in turn is chased by, sea monsters from a variety of different time periods. It's both more entertaining and educational.

1/5 Not on par with the "walking with" series
  by CeeTee (Flushing, NY USA)
This film disappointed me. The animation is sub-par and the feature itself is too short. The background story is weak and the music sounds like it was generated from a MIDI program on a kids PC. Save you money and rent it instead. This film is not in the same class of quality as the "walking with" series.

3/5 Not very good for adults, nor for kids
  by Passek (MD)
The scenario and some scenes look childish, and the CGI looks like that of an old video game. It is only for kids. Nevertheless, it includes many 'educational' scenes, which the kids don't enjoy. Walking with... series of BBC was good for both adults and kids. This is not for anyone.

2/5 OK if you enjoy computer created animation
  by Tiger Chen (Bay Area, CA)
I guess I was a little disappointed that this whole film was computer created animation even though the images were realistic. If you enjoy watching prehistoric creatures in action, this may be the video for you but I enjoy "live" animals much much more so I was really not too turned on by this film.

5/5 Great movie!
  by Carolyn A. Campbell (Clifton Forge, VA)
We bought this movie for my son for Christmas. He loved it. He is a budding scientist, archeologist, magician, and jedi knight. This movie fit right into his every day adventures.