It features the adventures of two koala brothers named Frank and Buster, who pilot an aeroplane as they seek to help their friends in a sleepy town in the Australian outback.

In Australia, the show runs in episodes of around 12 minutes' length, though these are broadcast in pairs on ABC Kids, with the opening song "Call the Koala Brothers" repeated in instrumental form over the credits.

], in visual style and ethos, a children's book and TV show proposal entitled "The Great Wungle Bungle Aerial Expedition", which featured characters specifically dubbed "The Koala Brothers" and focusing on the adventures of altruistic animal outback aviator rescuers in homemade flying contraptions at a comical desert airstrip, rescuing others or helping out friends with no thought of personal reward.

[citation needed] The book first appeared along with accompanying specially designed animatronic character props at the "FirstState88" NSW Govt exhibition in Darling Harbour in Sydney as part of the Australian Bicentenary in 1988.

In the 1990s, the book and exhibit's creator Greg McKee revised the concept as an animated TV show proposal called "Echidna Airways" which circulated at Cannes.

[4][5] Archival footage of the Echidna Airways characters and flying machines is viewable here:[6] The show was purchased by Spellbound Entertainment and was pre-sold to CBeebies for a 2003 delivery.