1975 (production)

January

 * 16 January - The BBC's Audience Research Dept. filed an Audience Research Report on Robot Episode 1. The episode received a Reaction Index of 53. Reaction to new Doctor Tom Baker was mixed, with some respondents saying he would take some getting used to.

July

 * 22-25 July - Location filming for The Android Invasion took place. (REF: Doctor Who The Handbook: The Fourth Doctor)

August

 * 11-12 August - Studio filming for The Android Invasion took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Fourth Doctor)
 * 25-26 August - Studio filming for The Android Invasion took place at BBC Television Centre studio 8. (REF: Doctor Who The Handbook: The Fourth Doctor)