Spy creatures show the challenges of the ocean. From a baby whale in danger and marine iguanas battling storms, to a mantis shrimp's knockout punch, the spies are never far from trouble.

Spy creatures uncover surprising undersea relationships, as sharks befriend fish, whales play with dolphins, and lobsters do the conga in seas where even spider crabs have friends.

Spy Creatures explore animal emotions, showing the deep feelings we share. With surfing dolphins, kissing manatees and sensitive cuttlefish, it's an amazing, emotional rollercoaster.

In this first episode, we see the spies search for intelligent life and mind-boggling ways of thinking. The largest and most ambitious spy creature ever built has a close encounter with the owners of the largest brains on the planet: sperm whales. Spy whale is the same size as a newborn whale calf and can swim and dive like the real thing.

In Thailand, spy macaque swims with freediving monkeys and captures behaviour that has never been seen before: macaques catching fish with their bare hands. In Japan, spy puffer fish encounters an artistic genius, a male Japanese puffer fish that crafts exquisite sand sculptures to woo a mate. Spy puffer becomes the artist's assistant as it finds shells to help it complete its masterpiece.

In the Caribbean, spy hermit crab loses its camera shell to a real hermit crab during a house swap. The thief becomes an unwitting camera operator and gains a crab's-eye view as the crabs line up to exchange shells in order of size. Also in the Caribbean, spy pig joins a colony of wild pigs as they cleverly take to the ocean to find food.

From fish that use teamwork to solve problems, to a rare social gatherings of whales in deep conversation, this action-packed first episode gains startling new insights with feats of intelligence surprisingly similar to our own.