Neither Ian Marter nor John Levene found The Android Invasion a pleasant experience, as the new production team's deemphasis of the UNIT format had become progressively apparent. Levene also missed Courtney's presence on set.
Originally, a key plot element was that the Kraal androids were in fact mirror images of the people they were imitating, and this was how the Doctor deduced that "Sarah Jane" was actually a robot. It was eventually decided that this would be too technically demanding to realise, and the action was suitably amended.
This episode was watched by 11.3 million viewers on its original transmission.