The adventures of Frank and Buster, two intrepid young koalas who fly around in their yellow plane on a mission to help other creatures in the Australian outback. Sammy secretly dreams of being the first shopkeeper to walk on the moon. He confides in Buster, who asks Frank if he can build a rocket for Sammy. Frank misunderstands, and builds a miniature rocket. When Sammy arrives to go on his space flight, he's disappointed, so Frank and Buster take him on a night flight in the plane instead.