With their constant yelling and arguing, the baboons are giving the entire zoo a headache. The constant commotion is keeping Jenny the lion awake, making Mani the rhino's ears ring and it's stopping gorilla Jurgen from reading his 'book'. With all the zoo's animals at breaking point, the pressure is mounting on baboon keeper Kate to keep her pesky primates happy and quiet. Most of her presents and tricks backfire spectacularly, making the bothersome baboons even more noisy, but finally she stumbles on something unexpected that keeps them very quiet indeed.

The army is called in to help with some major renovations around the zoo. Jurgen the gorilla immediately assumes the extra muscle power is to help build his new luxury gymnasium, complete with hot tub and juice bar. But miniature megalomaniac monkey, Brutus, has other plans for the army - he wants their help to build his 'Death-ray of World Domination' - but will either of their demands be met?