ðə kˈɑːnsɛpts ænd kˈæɹɪktɚz ɑːɹ dᵻɹˈaɪvd fɹʌmðə nˈaɪntiːnhˈʌndɹɪd sˈɛvənti sˈɛvən tˈɛlᵻvˌɪʒən sˈɪɹiəl ðə ɹˈoʊbɑːts ʌv dˈɛθ ænd ɹiːjˈuːzd ɪnðə spˈɪnɔf ˈɔːdɪˌoʊ sˈɪɹiz kˈældoːɹ sˈɪɾi.
The concepts and characters are derived from the 1977 television serial The Robots of Death and reused in the spinoff audio series Kaldor City.