A common myth is that this story has the lowest ratings of any "Doctor Who" story. This myth likely stems from a misunderstanding of the difference between audience share and Audience Appreciation scores. The former indicates the size of the viewing audience, and the latter is based on a survey gauging the viewers' opinions of the programme. In fact the audience size for the serial ranged from 6.5 million viewers for the first episode, to 5.7 million for the last. However, the Audience Appreciation scores for the last three episodes equalled or went below the lowest scores for "Doctor Who", with the very last episode, "The O.K. Corral", having a score of 30%, the lowest ever to date.