Simon Pegg had grown up with "Doctor Who" and considered it a "great honour" to guest star. He was pleased at being cast as a bad guy. Pegg had previously played Don Chaney in the Eighth Doctor audio play "Invaders from Mars". When the Editor announces the Jagrafess's name to the Doctor and Rose, he pronounces it as "The Mighty Jagrafress of the Holy Hadrajassic Maxaraddenfoe." Pegg has stated during interviews that he found this an extremely difficult line to say. Voice artist Nicholas Briggs had recorded voice work for the Jagrafess, but his contribution was not used because it sounded too similar to the Nestene Consciousness (which Briggs had voiced in "Rose"). "The Long Game" was produced singularly in the series' fourth production block. Filming in the studio took place at the Unit Q2 warehouse in Newport from 30 November to 3 December, on 7 December, and from 10 to 15 December 2004. The spike room set (used for Floors 139 and 500), the control room set, and the suburban house set were recorded at the former BT building in Coryton, Cardiff on 6, 8, and 9 December. The house set was later rebuilt for recording in the Newport warehouse on 15 December. The Jagrafress was entirely made of computer-generated imagery (CGI), animated by The Mill. It was given a shark-like design, with the intention that it would "snap out" like a shark. The initial design was also described as a "lump of meat on the ceiling".