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Watch Doctor Who 2005 Season 9 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

The Doctor travels back to 1980 with Bennett and O'Donnell to try and stop the Fisher King from sending the message that dooms the base in the future. Meanwhile, in the future, Clara, Lunn, and Cass fight to survive the ghosts and discover that their enemies have expanded their ranks.