The adventures of Frank and Buster, two intrepid young koalas who fly around the Australian outback in their yellow plane, on a special mission to help other creatures in need. Frank and Buster invite everyone to spend Christmas Day with them at the Homestead, but they are devastated when they discover that Penny the little penguin has hurt her wing and won't be able to join them. They decide to let Ned and Mitzi take over preparations for Christmas and go to the Antarctic to fetch her.