Details of his sequel trilogy treatments included the conclusion of the Skywalker family's story, with its third generation being portrayed in their twenties. Lucas hoped to explain concepts he had imagined when he originally drafted his saga in the 1970s. Most specifically he revealed the "symbiotic relationships" between the Jedi, the Force, midi-chlorians (microscopic lifeforms, first mentioned onscreen in 1999's "The Phantom Menace"), and the Whills (all-powerful creatures first mentioned in the title of the original outline of "Star Wars", "Journal of the Whills"):