The development of the series began with the production pilot episode, written by Graham Duff and produced by Baby Cow Productions in March 2003. The episode, which eventually became "Night of the Vegetarians", featured much of the final cast, but with a number of differences: a different actor played Rory, and Sir Ronald Rolands was voiced by Duff, while Gemini originally had two voices: a female voice played by Julia Dalkin, and a male voice by Nicholas Briggs. Malcolm Boyle - who wrote the Nebulous theme and edited the pilot - had written an entire original score for the show. However, due to BBC radio budget limitations, this was not used in the completed series. Nicholas Briggs had also originally created a very deep, realistic soundscape, similar to those he had created for the Big Finish Productions Doctor Who audioplays, but was advised that "it's likely the listener will have distractions and will not listen to it more than once; therefore, the soundscape must be totally accessible from any point in the episode", toning down the sound effects to match the series' comic nature.