Doctor Who: The Crimson Horror had an Appreciation Index (AI) of 85.
The Appreciation Index or AI is a measure of how much the audience enjoyed the programme. The score, out of a hundred, is compiled by a specially selected panel of around 5,000 people who go online and rate and comment on programmes.
This AI figure is identical to the previous two episodes, Journey to the Centre of the TARDIS and Hide, but is still lower than what Doctor Who usually achieves.
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