Mega Shark Versus Giant Octopus
During Prehistory, this Megalodon was frozen in an iceberg during a fight against Giant Octopus. In Present days, some whales accidentally release the two monsters by breaking the iceberg and they both rampage across the Pacific.
Mega Shark devours a whale and later attacks a plane flying over the ocean. Much later, a U.S. naval destroyer confronts him but he manages to destroy it. Afterwards, he destroys another destroyer and then bites off a part of the Golden Gate Bridge, killing many people.
Finally, some scientists succeed to lure the two prehistoric monster at the same place by using pheromones. They continue their fight and apparently both kill each other.
Mega Shark Versus Crocosaurus
In this film, it's revealed that Mega Shark has survived to his fight against Giant Octopus. He confronts a giant crocodile named Crocosaurus during the movie.
Mega Shark Versus Mecha Shark
Mega Shark returns in this movie where he confronts a robotic version of himself named Mecha Shark.
Mega Shark Versus Kolossus
In this movie, Mega Shark confronts a giant robot named Kolossus.