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About the Doctor Who discussion on Susan being left in the past, Susan was actually left in the future (22nd century?), after the Daleks had conquered the Earth. I'm just guessing on the year - Vicki is from the 25th century and she mentions the Dalek invasion of Earth was 300 years before her time (The Space Museum). The Doctor hasn't "forgotten" about her, modern times just won't catch up to that timeline for another 100 years or so.