Mega Shark Vs Giant Octopus is one of a number of The Asylum's ludicrous "Versus" movies that was released directly to DVD, in this case back in 2009 (the others being 2010's Mega Shark Vs Crocosaurus and 2014's Mega Shark Vs Mecha Shark - but we're only including one on this list so not to be repetitive, as they're effectively part of the same franchise). This particular film saw a group of scientists out at sea studying the migration patterns of whales, when a military helicopter dropped experimental sonar transmitters into the water, causing a pod of the animals to go out of control and start ramming a nearby glacier. The glacier in question, however, had preserved two gigantic prehistoric creatures - the titular Mega Shark and the Giant Octopus - and the two came to life when their frozen prison is destroyed and proceeded to battle for ocean supremacy. Of course, the battle ends up involving humans and ridiculous scenes like the Mega Shark taking a passenger plane out of the sky ensue. The special effects are awful and the movie is best avoided. Ridiculous stuff.
