The One Zoo Three brothers join big-cat keeper Briony at the cat sanctuary, where all the animals are limbering up for a very special day of sport. Rare amur leopard Xizi tackles a specially prepared assault course, while snow leopard Khumbhu is put through his paces as he begins training for a marathon move. Meanwhile, Jua the cerval baffles the brothers with her aerial acrobatics in the high jump, and Yazi the puma sinks her teeth into a game of basketball. Cam puts his foot in it while cleaning out Aquarius the fishing cat's stinky diving pool, and Tyler puts his super-sensitive sniff to the test as he tries to guess Whose Poo? And the boys look back on their African adventure, where they help a conservation project in Kenya track down lions and help protect them in the wild.