Nature's Microworlds journeys to some of the planet's most remote habitats and looks at the ecosystems that have developed there. Monterey Bay on California's coast is one of the most diverse marine ecosystems in the world, from microscopic plankton to visiting ocean giants. In this episode, Steve Backshall guides us through the bay’s unique geography and introduces some of its key characters in a quest to find the one species that keeps life in the kelp forest in balance. A BBC Production.

Originally released by BBC Worldwide Learning, 2012. Streaming video file encoded with permission for digital streaming by Infobase on October 03, 2015.