Discovery's Shark Week kicks off Sunday with several gasp-inducing shows, many with titles that seem more sci-fi than science.

Some very interesting titles for Shark Week including Lair of the Mega Shark. Sharkageddon.  Spawn of Jaws 2: The Birth.  Zombie Sharks.  Alien Sharks: Return to the Abyss.

Discovery is even bringing back Megalodon that drew criticism last year for its dramatization of a giant prehistoric shark.

Discovery says this 27th Shark Week features more original hours than ever before.  It wraps up on Aug. 16 with Sharksanity.

The ratings stakes are high.  Last year's Shark Week was the most-watched in the franchise's history, according to Nielsen.

Speaking of Shark Week, check out the movie clip from a Shark Classic.  Jaws!