involving Jack's ship and the TARDIS took place at the studio at Unit Q2. Extra TARDIS scenes were shot on 7 February. Scenes in the Lloyd's house were filmed on 28 January. Glamorgan House in Cardiff was used for the officers' club scene on 8 February. Location filming also took place at the Barry Tourist Railway. Barry Island and its now-demolished Butlins holiday camp had previously been the filming location of the Seventh Doctor serial, Delta and the Bannermen. The sound of Dr Constantine's skull cracking as his face changes into a gas mask was considered too horrific in its full form by the production team and was cut before broadcast. However, writer Steven Moffat claims on the DVD commentary to this episode that the sound was discussed but never put on. According to the Doctor Who Confidential episode "Fear Factor", the effect was added in the version of the episode presented on The Complete First Series box set. Casting for Captain Jack Harkness began around June with particular consideration to John Barrowman per the request of executive producer Julie Gardener. Unlike previous episodes, the "next episode" trailers were shown after the end credits instead of immediately preceding them, possibly in reaction to comments after "Aliens of London" about having the cliffhanger for that episode spoiled. Writer Steven Moffat says in the DVD commentary for this episode that the Doctor's reply to Rose asking him what she should call him ("Doctor who?") was originally going to be, "I'd rather have Doctor Who than Star Trek," a metafictional dig at the latter programme. This is the first televised Doctor Who story to make a direct reference to Star Trek. The Chula ships are named after Chula, an Indian/Bangladeshi fusion restaurant in Hammersmith, London where the writers celebrated and discussed their briefs on the scripts they were to write for the season after being commissioned by Russell T Davies. This meeting was videotaped, and is available on the DVD release of Doctor Who — The Complete First Series. The episode was initially smaller in scale and personal with writer Steven Moffat saying that "there was no big enemy and the major fear factor was a little boy looking for his mummy. Doctor Who can be small and domestic, and brilliantly effective." Broadcast and reception "The Empty Child" received overnight ratings of 6.6 million viewers, a 34.9% audience share. When final ratings were