Sea Monsters

The BEST episodes of Sea Monsters

Every episode of Sea Monsters ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Sea Monsters!

In this thrilling adventure from the creators of Walking with Dinosaurs, renowned zoologist Nigel Marven plunges into the prehistoric deep to face some of the largest and most fearsome sea predators that ever existed – creatures so awesome, they make the great white shark look like a goldfish. Scour the depths of seven different prehistoric seas with Nigel as your guide – and marvel at the computer animation techniques that bring each aquatic world to life. Get up close and personal with creatures like the vicious sea scorpions of 450 million years ago, the armor-plated fish of the Devonian Period and a whale-chomping shark called Megalodon. Finally, wade out into the deadliest sea of all time – "Hell's Aquarium" of the late Cretaceous, an ominous body of prehistoric water that gets its name from its elevated water temperatures and the devilish creatures that call it home

Last Updated: 8/23/2022Network: BBC Four
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To Hell... and Back?
star
9.29
7 votes

#1 - To Hell... and Back?

Season 1 - Episode 3 - Aired 9/23/2003

After leaving the Pliocene, Nigel explores the second deadliest sea, the Jurassic (155 million years ago). There, he meets the giant filter-feeding fish Leedsichthys and predators such as the shark Hybodus and the marine crocodile Metriorhynchus. The apex predator of the Jurassic sea is the giant pliosaur Liopleurodon, which Nigel keeps away through spraying putrescine at them when they approach him. Nigel then travels to "Hell's aquarium", the Cretaceous (75 million years ago). The sheer number of different predators present, including sharks, giant predatory fish Xiphactinus and giant mosasaurs, makes the Cretaceous the deadliest sea of all time. In addition to predators, Nigel also encounters a variety of other Cretaceous animals, such as the aquatic bird Hesperornis, plesiosaur Elasmosaurus, pterosaur Pteranodon and giant sea turtle Archelon.

Directors: Jasper James
Watch Now:AmazoniTunes
Dangerous Seas
star
6.66
41 votes

#2 - Dangerous Seas

Season 1 - Episode 1 - Aired 9/9/2003

Nigel travels back in time to the seventh deadliest sea of all time, the Ordovician period (450 million years ago), where he is attacked by sea scorpions and comes face-to-face with a giant orthocone. He then explores the sixth deadliest sea, the Triassic (230 million years ago), where he encounters a pair of Nothosaurus, the bizarre sea reptile Tanystropheus and the giant primitive predatory ichthyosaur Cymbospondylus, which Nigel keeps at bay through using a cattle prod. Nigel then dives in the fifth deadliest sea, the Devonian (360 million years ago). In the Devonian, Nigel encounters the strange primitive shark Stethacanthus and the placoderm Bothriolepis and he uses a rounded shark cage to protect himself from the giant predatory placoderm Dunkleosteus.

Directors: Jasper James
Watch Now:Amazon
Into the Jaws of Death
star
6.62
37 votes

#3 - Into the Jaws of Death

Season 1 - Episode 2 - Aired 9/16/2003

Leaving the Devonian, Nigel travels forward in time to the fourth deadliest sea, the Eocene (36 million years ago), where he encounters the strange elephant-related Arsinoitherium. Diving in the Tethys Sea, Nigel encounters the primitive whale Dorudon and the crew of The Ancient Mariner uses recorded whale sounds to attract the giant predatory primitive whale Basilosaurus. In the third deadliest sea, the Pliocene (4 million years ago), Nigel encounters the strange whale Odobenocetops and dives with a adolescent megalodon shark. He later uses the rounded shark cage to dive with an adult megalodon, the largest shark of all time.

Directors: Jasper James
Watch Now:Amazon

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