Empire's 30th birthday celebrations continue unabated with this very special podcast documentary - or, if you will, podumentary - exploring the biggest film of all time: James Cameron's Avatar.

Host Chris Hewitt dips into the Empire archives, and also sits down for a brand-new chat with Cameron, the film's writer-producer-editor-director, to tell the story of how Cameron's groundbreaking visit to Pandora came to be. It's packed with info about Cameron's Eureka! moment, how he nearly chose to direct what would become Alita: Battle Angel instead, and some very interesting revelations about casting the film's hero, Jake Sully.

Enjoy.