"The End Of The World" is the first episode of the revival to be set in the future. Due in part to the numerous SFX shots the episode ate most of the series' SFX budget. The episode also features numerous intricate costumes. Location filming principally took place in Cardiff in October 2004, with some additional scenes shot in Cardiff and Penarth in November 2004 and February 2005. Studio work was recorded in the Unit Q2 warehouse in Newport from September to November 2004. The episode marked the first appearance of Cassandra and the Face of Boe, both of which would appear in the sequel episode New Earth.