sentences:  Broadcast during a strike that took ITV (the BBC's rival) off the air, "City of Death" scored high ratings.The fourth episode was watched by over sixteen million viewers, the highest UK television audience ever attained by an episode of "Doctor Who".Although, in retrospect, it has been regarded as one of the best serials from "Doctor Who" classic run, the initial reception was not as positive, with criticism of the humorous tone.