The adventures of Frank and Buster, two intrepid young koalas who fly around the Australian outback in their yellow plane, on a mission to help creatures in need. It is George's birthday and the Koala Brothers know just what to get him - a trolley to help him with heavy parcels, which they order from the shop. The trouble is, George finds a big parcel first and thinks he'll have to take it to the Koala Brothers' homestead.