A frightened Doctor, a companion who's catching on to the darker side of time travel faster than most, a ghost, imaginative storytelling, and a couple of love stories all combined in this overall satisfying, creepy, and emotionally juicy episode.
Trivia: The Doctor uses a crystal from Metebelis Three. The crystals were last seen in the original series "The Planet of the Spiders" in 1974: the same year this episode takes place.
The Doctor: I'm looking for a ghost.
Palmer: And you are?
The Doctor: I'm the Doctor.
Palmer: Doctor what?
The Doctor: If you like.
The Doctor: Oh. Oh look. Oh lovely, the ACR 90821. Oh, bliss. Nice toggle switches. Ooh, I do love a toggle switch. Actually, I like the word "toggle." Huh. Nice noun, excellent verb.
Clara: Say we actually find her. What do we say?
The Doctor: We ask her how she came to be. Whatever she is?
The Doctor: Because I don't know. And ignorance is... umm, what's the opposite of bliss?
The Doctor: Yes. Yes, Carisle. Ignorance is Carisle.
The Doctor: Do you feel anything?
The Doctor: Your pants are so on fire.
The Doctor: What do you think?
Clara: Uh, color's a bit boisterous.
The Doctor: I think it brings out my eyes.
Clara: Makes my eyes hurt.
Clara: I mean, one moment you're in 1974 looking for ghosts. But all you have to do is open your eyes and talk to whoever is standing there. To you I haven't been born yet. And to you I've been dead a hundred billion years. Is my body out there somewhere, in the ground?
The Doctor: Yes, I suppose it is.
Clara: But here we are, talking. So I am a ghost. To you, I'm a ghost. We're all ghosts to you. We must be nothing.
The Doctor: No, no. You're not that.
Clara: Then what are we? What can we possibly be?
The Doctor: You are the only mystery worth solving.
The Doctor: Listen, all I need to do is dive into another dimension, find the time traveler, help her escape the monster, get home before the entire dimension collapses, and Bob's your uncle.
Referencing the hit 1984 comedy movie Ghostbusters starring Bill Murray, Dan Aykroyd, Harold Ramis, and Ernie Hudson as amateur ghost hunters who go into business exorcising ghosts and call themselves "The Ghostbusters." The movie spawned a sequel, video games, comic books, and an animated series.
The Doctor: Birds do it, bees do it, even educated fleas do it.
Referencing Cole Porter's 1928 song "Let's Do It, Let's Fall in Love." The song was featured in Porter's first successful musical, Paris.
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