The story's cliff-hanger also presented fans with a preview of the Daleks' third appearance. Their return was awaited impatiently, a fact that was baited by the appearance of a Dalek shell in The Space Museum (1965).
Salvin Stewart (Morok Messenger/Morok Guard) also provided the voice of the computer guarding the armoury in this episode, but was uncredited on-screen.
This episode was watched by 8.5 million viewers on its original transmission.
The Daleks at the end of the episode do not have the metal band of their predecessors.