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The Fifth Doctor hoped to observe the point of first contact between the Neanderthals and the Cro-Magnons. He failed to witness the event, not realising that his observation of them was the cause of the first contact. (PROSE: Observation)
Before meeting the Fifth Doctor, on vacation in Lanzarote, Peri Brown said to her stepfather she wasn't with her mother because she didn't want to spend an afternoon exploring a Cro-Magnon cave. (TV: Planet of Fire)