Theories
Miles and Wood suggest that the key word is "Limitation"; that is, the effect limits the amount of interference in the past as opposed to completely prohibiting it. This interpretation is supported by the Barry Letts-written Doctor Who radio play The Paradise of Death (1993), where the Third Doctor explains to Brigadier Lethbridge-Stewart that it is possible to leave a location in the TARDIS and arrive at a time before they actually left, since the Effect only stops someone from interfering with their own past. Although the First Doctor claimed that it was impossible to alter history in The Aztecs (1964), and the concept of unchangeable "fixed points in time" has become a recurring concept in the 2005–present revival, other stories such as The Time Meddler (1965), Day of the Daleks (1972), Genesis of the Daleks (1975), Pyramids of Mars (1975), Remembrance of the Daleks (1988), and A Christmas Carol (2010) imply that changing history is still possible.
Read more about this topic: Blinovitch Limitation Effect
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