Pre-production

Pre-production is the preparation made before filming of a television show or movie begins. This often entails writing, casting, design, etc. In the case of Doctor Who, most television stories had completed pre-production and exist in at least audio form. However, a good number of planned stories were dropped during pre-production for numerous reasons, most notably the original Season 23 of the show, which was completely shelved in favor of the Trial of a Time Lord story arc, and The Final Game, which was dropped following the sudden death of Roger Delgado.