An earlier version of this episode that, with a full repeat of the sequence on Inter Minor from Episode One and extra scenes cut from the broadcast version runs for an extra 5 minutes, was inadvertently sent to Australia for broadcast. [This also happened with Frontier in Space, Episode Five.] This version included a revised synthesiser arrangement of the theme music by Paddy Kingsland - the "Delaware" theme, so called because of where it was made.
This alternative version of Episode Two was the one used on the video release. The DVD release has the broadcast version of the episode, with the new Delaware theme and the extra scenes included as special features on the disc.