The adventures of Frank and Buster, two intrepid young koalas on a mission to help other creatures in the Australian outback. Penny the penguin is coming to stay, and Buster wants to make the stay special. He welcomes her with fish paste sandwiches, but Penny leaves them to help park the plane. Buster organises skittles, but Penny helps fix the post box instead. Whatever Buster organises, Penny wants to do something else. Buster realises that Penny enjoys helping with the Koala Brothers' chores.