The Blinovitch Limitation Effect is a fictional principle of time travel physics in the universe of the long-running British science fiction television series Doctor Who.
It is usually understood as having two aspects: firstly, that a time traveller cannot "redo" an act that he has previously committed, and secondly, that a dangerous energy discharge will result if two temporal versions of the same person come into contact. The first aspect is similar to a real-world physics conjecture, the Novikov self-consistency principle.
How the Blinovitch Limitation Effect works has never been made clear by any of the television programme's production teams. It remains a convenient plot device rather than an attempt to rationalise time travel in the Doctor Who universe.
Read more about Blinovitch Limitation Effect: The Original Series, Theories, The New Series, Popular Culture
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