The episode was Gareth Roberts' first writing credit proper on the show, however he had written for Doctor Who many times before. He started writing some Virgin New Adventures, a series of "Doctor Who" novels, with "The Highest Science" (1993). He went on to write several more books for Virgin Books and further "Doctor Who" spin-offs. With the new TV series, Roberts again produced a tie-in novel ("Only Human", 2005) and then various smaller jobs for the TV show, including the "Attack of the Graske" digital television interactive mini-episode and the TARDISODEs.