The Spy Creatures travel to the temperate lands north of the tropics where life is governed by the rhythm of the seasons.

In the spectacular snow-covered mountains of Japan, Spy Macaque records how snow monkeys bathe and socialise at steaming hot thermal pools. In the cool mountains of Mexico, Spy Hummingbird takes us into the heart of what must be the world's most beautiful natural gathering as billions of spectacular monarch butterflies overwinter. In Manitoba in Canada, Spy Snake takes us on journey inside the moving masses of male garter snakes to discover an imposter in their ranks - a male pretending to be a female. Spy Bear, Spy Bald Eagle and Spy Salmon reveal how grizzly bears and bald eagles gather in Alaska to await one of nature's most spectacular feasts - the arrival of thousands of sockeye salmon returning from the sea to spawn. And closer to home, as autumn arrives in England, Spy Squirrel witnesses first-hand how grey squirrels find and bury food each year for the winter, remembering the locations of up to 4000 nuts. Spy Squirrel also becomes caught up in a fight between rival stags as they fight over females. Could this be its last assignment?

The Spy Creatures travel to the lands of ice and snow beyond the Arctic and Antarctic circles, observing the hardiest and most charismatic animals in the polar world.