After being hand-reared, Yoyo the penguin is confused: he thinks he's a human.

Thanks to his identity crisis he doesn't fit into either the human or penguin world, and just when it looks like things can't get much worse, all his feathers start falling out.

Cast away as a ugly misfit all hope seems lost, but what appears a curse turns out to be a blessing in disguise when Yoyo returns to Penguin Beach completely transformed.

It's the day of the zoo's annual stock take. As all the animals get ready to be counted, a group of tiny frogs take the opportunity to escape to Paris. Meanwhile, Jurgen has misinterpreted the stocktake - thinking the counts are scores out of ten. The four gorillas 'scored' only four in the previous stocktake, so he imposes a strict training regime to get the gorillas into shape for a higher score this year. His workout plan gets cut short however, when a rumour surfaces that the escapee amphibians may actually be deadly. Will the zoo ever be safe again?