In 2006, Doyle appeared in "Two Men In A Tinnie", a documentary of his own making involving a trip down the Murray-Darling river system of Australia with his longtime friend, biologist Dr Tim Flannery. The program focuses on the degradation of the once mighty rivers and gives many different insights as to the causes. John and Tim reprised their collaboration in 2008 with "Two In The Top End" where they explored northern Australia and subsequently in 2012 with "Two On The Great Divide" where they travelled along the 3500 km long Great Dividing Range, and in 2014 with "Two Men in China".