In the audio commentary, the producers reveal that Graeme Harper filled in to direct some scenes after director Colin Teague was injured.

Graeme Harper (born 11 March 1945) is a British television director.

Trevor Cooper was cast as Colin Devis at the suggestion of Graeme Harper who had worked with him on Doctor Who and in theatre.

Graeme Harper, director of Davison's final serial The Caves of Androzani, directed the episode.

Directors were Juliet May, Baz Taylor, Graeme Harper.

The episode was written by Keith Temple and directed by Graeme Harper.

According to Graeme Harper on the episode commentary, the pre-credits sequence was written by Russell T Davies as he was not satisfied with the original opening.

Colin Spaull played the role of Lilt in Revelation of the Daleks, which was also directed by Graeme Harper.

Episode commentary by Graeme Harper, Neill Gorton and Rob Mayor (MP3)

Graeme Harper is a professor, fiction writer, scriptwriter and cultural critic, who writes under his own name and under the pseudonym Brooke Biaz.