Robert Llewellyn wrote this episode with the intent to feature very little of Kryten, as he increasingly disliked the application of the Kryten makeup. However, after numerous revisions of the script by Naylor, Kryten became an integral part of the episode. Plus Llewellyn also had to play the part of another mechanoid, Kryten's "brother", Able. This meant that, despite Llewellyn's original intention, he had to wear the Kryten makeup twice as much, as Able appeared in the same costume coloured green instead of black.