West African mandrill JC is being challenged for his dominant position by his sons Ludo and Jareth. While JC is taken to the vet's for some health checks, Ludo gets 'over-friendly' with his dad's girlfriend. The keepers are concerned that the situation might turn nasty when JC returns. Male red panda Jung is losing weight and the keepers can't work out why. After relationship problems with his partner Nima are ruled out, Jung is put on a special diet, but with no success. So Jung undergoes a full medical examination and keepers have to make a difficult decision. Sumatran tiger Kirana and her daughter Kasarna have started to clash at mealtimes. The keepers have a plan to sort out the tension between them. Tempers start to fray among Chester Zoo's Humboldt penguin colony during the annual moult. Can young penguins Frazzle and Munch avoid being picked on by the grown-ups?