The actor embarks on a quest to fulfil his ambition to swim with giant manta rays. His journey starts in the Cayman Islands in the Caribbean, before he moves on to an aquarium in the American state of Georgia. In Ecuador he meets ray expert Dr Andrea Marshall, and in Sri Lanka finds out that the creatures are being hunted by fishermen because of the use of their gills in Chinese medicine. Martin's dream finally comes true when he travels to the Maldives in the Indian Ocean and swims with 40 feeding mantas.