Roots: There are references to The Wizard of Oz, Neil Armstrong, and Snow White and the Seven Dwarves.
Continuity: The Talerians are from the planet Taleria. They are approximately the same height as a human, with swollen, smooth limbs and no neck. The have a single, huge oval-shaped eye and bulbous heads with skin covered in gelatinous pustules. They have stubby clawed fingers. They have viscous, liquid-based bodies which are much more fragile than those of a human, and each generation is more fragile than the one before. They use technology to transmit their minds into human bodies in their search for more robust forms.
A traffic warden signs the Doctor’s psychic paper; the Doctor tries using the other side, but whatever appears on it is back-to-front as a result. The Doctor and Amy wear space suits whilst on the Moon.
Amy’s mind is wiped and her body possessed by a Talerian.
Links: The Doctor notes that he hasn’t died “for months” and is quite hungry afterwards (The End of Time, The Eleventh Hour). He tells Amy that the Moon base will one day be a penal colony (Frontier in Space) and later mentions T-mat (The Seeds of Death). Jackson refers to negative thoughts as Keller-impulses (The Mind of Evil). Jennings mentions UNIT and Torchwood. There are references to the British Mars Probe mission and M3 variant fuel (The Ambassadors of Death).
Location: London; near Houston in Texas; and the Moon, Autumn .
Unrecorded Adventures: The Doctor received an honorary degree in rhetoric and oratory from the University of Ursa Beta.
The Bottom Line: “Houston, we have a problem.” Typical Richards, i.e. a workmanlike plot with forgettable monsters and dull supporting characters. The Talerians, once they physically appear, are pure B-movie.