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"Constant" redirects here. For the episode, see The Constant.

Daniel Faraday explains that when a consciousness travels back and forth through time, it needs a constant to latch on to. A constant is an object or person that exists in both periods of time, that the traveller deeply cares about and could recognize. If a constant is not found, the oscillations between different times will become more frequent and chaotic until the individual dies from what appears to be a severe brain aneurysm. Faraday's lab rat, Eloise, experienced this fate when it was unable to recognize the difference between the present and the future. Minkowski seems to have experienced the same fate and appears to have died aboard the freighter, and it is implied that the same thing happened to Brandon. ("The Constant")

Individual constants

4x05 Journal end

The page from Daniel Faraday's journal

  • Desmond chooses Penny as his constant; he is able to reach her in both times.
  • Faraday notes in his journal that he will use Desmond as his constant if "something goes wrong".
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