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 the postman shows Mitzi a postcard of a sandy beach, and she decides to go on holiday. When she starts packing, she realises she can't bear to leave anything behind, and feels homesick even before she's left. Frank suggests a short sightseeing trip in the plane, and Mitzi realises how much she loves her home.