A megalodon battles with a crocosaurus causing massive destruction. The US Army has to try and destroy the havoc creating monsters.

After escaping death during the fierce battle with the massive cephalopod in Mega Shark vs. Giant Octopus (2009), once more, Megalodon, the prehistoric beast from the sea, roams free in the open ocean, wreaking havoc. However, this time, an even greater adversary emerges from the dark depths of Congo's diamond mines, as a gargantuan primaeval Crocosaurus sees the light of day, leaving a trail of destruction in its wake. Inevitably, the two nightmarish creatures will have to confront each other, and in this ultimate fight, there can be only one winner. Is Dr Terry McCormick's ultrasonic device and the mighty U.S. Navy able to avert this unstoppable new menace?—Nick Riganas