The version of this chapter used in the VHS is a few minutes longer than the one originally transmitted by the BBC and features a discarded arrangement of the Doctor Who theme. This is because it was a rough cut assembled during post-production and never intended to be seen by the public.
This episode takes place on Earth, Draconia and the Ogron homeworld in 2540.
This episode was watched by 7.7 million viewers on its original transmission.