Sea Beast opens up on a sea fishing boat. It is being tossed around in the middle of a huge storm. Suddenly, a massive wave crashes on deck and a crew member is gone. The captain, Will McKenna (Corin Nemic), is sure that he sees something odd, but he has no clue what since the man could have been washed overboard or maybe even eaten by a shark. They return to shore, but Will isn't going to forget what he saw.
Not realizing everything her dad knows, Carlie McKenna (Miriam McDonald) heads out to a deserted island that her dad has a cabin on with her boyfriend Danny (Daniel Wisler) and her best friend Erin (Christie Laing). Erin's boyfriend Drew (Brandon Jay McLaren) is supposed to meet up with them after he gets off of work (he works for Will). Unfortunately for Drew and everyone else, the creatures that Will saw take his crew member have followed them back to land. Drew isn't going to be able to meet up with the rest of the crew. To make matters even worse on Carlie and company, the creatures are also headed to their island. Apparently these creatures are smart enough to cause the boat to drift out to sea, so they're stranded there with no cell service and no one that knows where they are.
Back on the mainland, Will and Arden (Camille Sullivan), a biologist that has come to help, are having a difficult time. Arden is there to try and identify a strange substance that they found on the dock. She tells them that it looks like something that a sea creature would excrete. Whatever it is, the victims can tell you that it's a highly effective paralytic. Can they figure out what is going on, what is attacking people, and stop it before everyone is dead?
At some point in this movie, about midway through, I started feeling like I had seen it before. We finally figured out that is it very much like Loch Ness Terror, except for the most part, the creatures are much better done! There were a few times where we made a comment on the CG and once it was obviously a bad puppet, but overall we weren't overly critical of them. Sea Beast even has the head-pulled-off-of-the-shoulders scene like in Loch Ness Terror, but it was better done too.
There aren't any additional features on the DVD for you to watch. I would have liked to see how they made some of it or maybe even deleted scenes, because I'm sure there were some, but I guess they're not necessary. On the whole, Sea Beast was a decent movie. I'm not sure I'd tell you to go buy it, but it is worth watching if you catch it on TV.