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. George wants to be a faster postman. He tries everything, but nothing works until Buster suggests he use a skateboard. He now delivers his post so early that he doesn't get to talk to anybody - they are all in bed! This teaches him that speed isn't everything and so goes back to his old routine.