Don’t watch this movie. The title of the movie says it all: Shitty, low budget, B Movie crud with absolutely no regard for a realistic storyline.
The story is exactly as the title suggests: A megalodon, or Mega Shark, and a giant octopus from the prehistoric ages battle it out for supremacy of the sea. Besides the stupid and predictable characters (made worse by the shoddy acting), the movie is riddled with factual errors and terrible CGI. For example, the military in this movie seems to consist of one gun-toting guy with some Top Gun aviators thrown on to make him seem legit. I’m sure glad that megalodons only existed millions of years ago since this one destroys the Golden Gate Bridge for shits and giggles and can jump 20,000 feet into the air just so he can snack on an airplane.

And the most unbelievable part of the movie? An Asian dude hooks up with a white chick. That’s just ridiculous and it never ever happens.
All in all, the combination of all this mediocrity is the recipe for a perfect B movie.