The radio serials were made with the full co-operation of George Lucas, who for one dollar each sold the rights to KUSC-FM, the public radio affiliate at his alma mater, the University of Southern California. Lucas also allowed the use of original sound effects and music from the films.
The series fleshes out the storyline by adding a great deal of back story that had probably been created but not used by Lucas. Examples include: PrincessLeia obtaining the Death Star schematics and her initial encounter with Darth Vader; Luke Skywalker using his binoculars to observe the movie's opening battle and trying to convince his friends at Tosche Station of what he saw; the skyhopper race that results in Luke's vehicle being damaged (seen in the movie in the background of his Tatooine garage); and Vader's interrogation of Princess Leia (a controversial scene for its intensity).
Many of the actors involved in the movie were unavailable to reprise their roles: Harrison Ford, for instance, was committed to the first Indiana Jones movie. Two of the actors, Mark Hamill and Anthony Daniels, returned to reprise their roles as Luke Skywalker and C-3PO respectively.
The success of the first series led to a 10-part, five-hour series based on The Empire Strikes Back, again written by Daley and directed by Madden.
Like the preceding series, The Empire Strikes Back expanded its story by incorporating new scenes that did not affect existing continuity. Examples include an Imperial attack on a Rebel patrol (set before the film's opening scene) and a tense conversation between Han Solo and Luke Skywalker, stranded in the Hoth wastelands awaiting rescue.
One of the unusual promotions that National Public Radio did for the radio serial was to get Craig Claiborne to create his version of Yoda's rootleaf stew recipe, which the Jedi Master served Luke in the hut on Dagobah. The recipe ran in magazines and newspapers across the country.
The Empire Strikes Back debuted on NPR on February 14, 1983.
NPR's plans for a third radio serial (which would be based on Return of the Jedi) were put on hold when federal funding for NPR was dramatically reduced after the election of Ronald Reagan. It was not until 1996 that a six-part adaptation of Star Wars Episode VI: Return of the Jedi was made by HighBridge Audio, the company that had released the first two series on tape and CD.
Like the preceding series, Return of the Jedi expanded its story by incorporating new scenes that did not affect existing continuity. Examples include Luke Skywalker constructing his new lightsaber and C-3PO conversing with Mara Jade in the palace of Jabba the Hutt.
Scriptwriter Brian Daley died before the series was produced, so "additional material" was contributed by John Whitman, who introduced changes required for continuity with the now-planned prequels, as well as any changes identified by the director and cast.
There are several radio promos, deleted scenes, and additional music tracks available that originated on previous releases of this collection and in the NPR broadcast versions.
BBC Radio 1 broadcast the series in the UK, with a key scene in the final episode clumsily cut for timing.
All three series have been released on cassette tape and CD.
The tracks are:
"Radio Promo #1 - Anthony Daniels"
"Radio Promo #2 - Ann Sachs"
"Radio Promo #3 - Mark Hamill"
"Star Wars Radio Drama - Additional Music"
"Star Wars Radio Drama - Alternate Take 'Your Father's Lightsaber'"
"Star Wars Radio Drama - Alternate Take 'Bail and Leia'"
"Return Of The Jedi Radio Drama - Alternate Take 'Speederbike Chase'"