Terrance Dicks confessed that he originally cut out the famous "Chap with the wings, five rounds rapid" line, but it was reinstated at Barry Letts's request.
Jon Pertwee on 'The Pertwee Years' VHS tape stated this was his personal favorite episode giving one of his reasons because Katy Manning, Nicholas Courtney, John Levene, Richard Franklin and Roger Delgardo appeared, which he regarded as his "Doctor Who Family".
The color master videotape of this episode was wiped by the BBC in the 1970s and the BBC only held a 16mm black and white telerecording. A poor quality color NTSC version taped on a home recorder also existed. The episode remained only in black in white until the 1990s, when the color signal from the NTSC version and the black and white telerecording were used to create a new color master on D3 digital tape.
This episode was watched by 8.3 million viewers on its original transmission.