King of the sea

Answer 1

I don't think there's just one king of the sea, I think there's 3.

Predator X:
A 50ft 45ton pliosaur with the 2nd most powerful jaws that were 10-11 times the strength of an alligators. Predator X had flippers the size of a small car, and 10ft jaws packed with ruler long teeth embedded in the front of the snout. Predator X's hunting methods were similar to a great white shark's, and they were able to tackle anything they chose.

Megalodon:
Megalodon was perhaps one of the most mind-boggling creatures ever. A 40-60ft. prehistoric shark that is a distant cousin of the great white, tiger, and mako sharks. This shark had the strongest jaws of any animal ever recorded on earth. If that weren't bad enough, its jaws were 6ft wide 8ft high, had hand-sized triangular teeth, and contained hundreds of colossal teeth. This shark was so big and ferocious that it preyed on whales, large and small, by biting their fins and tails off. It would make today's sperm whales look like a joke.

Mosasaur:
The mosasaurs were the prehistoric lizard and snake relatives who were like gangsters of their time. They could reach 40-55ft. in length, weigh up to 20 tons, and were extremely quick and flexible. Their families were like mobs because they would have up to a dozen of them living together patrolling and taking over the oceans. It should be mentioned that they were extremely aggressive, ate large sharks, and would make short-work of todays predators.