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The Meg on the cover of the first meg book

The Meg was the titular antagonist of Meg: A Novel of Deep Terror. It is a 75-foot-long (23 m) Megalodon, a shark said to have been extinct for million of years, that was accidentally released from the Mariana Trench by Jonas Taylor, who was examining the wreck of a submarine. The wreck was also caused by the Meg. This Meg wreaked terror until Jonas Taylor dove into the shark's mouth and used a Meg tooth he had found a few years before to rip out the heart of the creature. But before that happened, the Meg gave birth to a pup.