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The Blinovitch Limitation Effect was a natural function of the universe that described the effects of approaching and/or making physical or causal contact with a future or past version of yourself, an action that was also referenced as "crossing your own timeline." Several other concepts, such as temporal paradoxes, were related to the Blinovitch Limitation Effect, and it was sometimes unclear which specific observed reactions were due to this effect.
The Ninth Doctor said that prior to the time-locked destruction of the Time Lords in the Last Great Time War, his people could have prevented or mitigated the effects of a paradox. (TV: Father's Day) The Blinovitch Limitation Effect was modified by the Time Lords and their temporal technology on Gallifrey, although crossing one's own time stream required enormous amounts of energy and broke the First Law of Time. (TV: The Three Doctors)
The Doctor mentioned the effect when explaining why he or another cannot simply go back in time to take another try when a plan fails. (TV: Day of the Daleks) The Time Lords and other time-aware and time-active groups could, with technological assistance, suppress the effect. For example, The Time Lords once expended energy to suppress these effects, (TV: The Three Doctors) the Eleventh Doctor once used the sonic screwdriver to do so (PROSE: Touched by an Angel), and the Doctor's TARDIS did so herself when reconfigured into a multi-dimensional city. (PROSE: Cat's Cradle: Time's Crucible)
Blinovitch limitation field Edit
If an item or person crossed their own timeline and the past and future versions came near each other or physically touched each other, energy would be released. The Fifth Doctor called this "shorting out the time differential." In some cases, this energy caused memories to be transferred from the future to the past person, who then suffered amnesia until the person had experienced the event from both perspectives. (TV: Mawdryn Undead) The energy released from contact between two versions of a person was usually enough to overload any surrounding technology. Just by being in the same room, the two versions created a Blinovitch Limitation field, a crackling blue energy resembling lightning. (PROSE: Touched by an Angel) The Doctor has been able to purposefully dampen the effect through the use of a sonic screwdriver. (PROSE: Touched by an Angel)
During the total event collapse created by the explosion of the TARDIS, the Eleventh Doctor's sonic screwdriver sparked when touched to a later version of itself. The Doctor took this discharge of temporal energy as a confirmation that it was the same screwdriver, although he didn't name the effect. (TV: The Big Bang) A similar discharge was discussed by earlier incarnations of the Doctor who met. (AUDIO: The Light at the End)
The Eighth Doctor was electrocuted by the energy discharge produced by the collision of the two versions of a Blitzen fish haunting his TARDIS. He had hoped that the present and future versions of the fish would cancel each other out due to the Blinovitch effect. (AUDIO: Relative Dimensions)
Romana II was particularly concerned about the potential effects of physically touching another incarnation of herself, and as such declined her future self Trey's requests for a hug when the two first met on Gallifrey, and later she refused to allow Trey to help her seal off the Eye of Harmony for similar reasons. (AUDIO: Renaissance)
During a meeting of the Tenth and Twelfth Doctors, the two activated the effect as they argued, crossing fingers and creating a current of energy. This event also brought forth Reapers. The three raced back to The TARDIS, where the discovered that the Reapers had already disconnected the interior from the exterior of the ship. The were able to activate the effect again; the shock of the effect reconnecting the TARDIS to some part of its interior. (COMIC: Four Doctors)
In a majority of occasions when two individuals were in close proximity or touching, there was no energy discharge or energy field. In some cases, Time Lord or other temporal technology was available to dampen the effect, but even so previous incarnations were shown to have temporarily aged as a result of the time differential.
Time Lords Edit
The Doctor physically interacted with different incarnations of himself or with another version of the same incarnation (such as shaking hands) without the proximity or interaction triggering a Limitation Field or energy discharge. (TV: The Three Doctors, The Five Doctors, The Two Doctors, Time Crash, The Day of the Doctor, and COMIC: The Collector) At one time, the Eleventh Doctor was in an alternate universe that was suffering total event collapse as a consequence of the explosion of the TARDIS. He touched and was touched by a future version of himself. (TV: The Big Bang)
Turlough once speculated that the Fifth Doctor was unaffected by the Limitation Effect when he met his previous incarnations in the Tower of Rassilon on Gallifrey due to them having different bodies. (TV: The Five Doctors; PROSE: Turlough and the Earthlink Dilemma)
However, when the Tenth Doctor and Twelfth Doctor accidentally touched hands during an encounter in Paris in 1923, both received a painful shock from what the nearby Eleventh Doctor identified as the Blinovitch Limitation Effect. This incident confirmed to the other two Doctors that the Twelfth Doctor was one of them. (COMIC: Four Doctors)
A Time Lord device called the Blinovitch Limitation Effect limiter existed. It limited the effects of the Blinovitch Limitation Effect, allowing one to safely interact with one's past selves. The third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth and thirteenth incarnations of Drax conned the Fourth Doctor into stealing the limiter, which was what allowed them to cooperate on this scheme in the first place. (AUDIO: The Trouble with Drax)
Even some humans did not trigger the effect. Rose Tyler created a temporal paradox by saving her father, Pete Tyler, from death. The Ninth Doctor had allowed Rose to make a second attempt to comfort her father while he died, and they hid from their earlier selves. Rose rushed out passing within several feet of herself from an earlier time, and their earlier selves disappeared. Later, when Rose was standing near herself as a baby, and later still, when Pete thrust Rose, the baby (well bundled), to adult Rose, to hold, this did not produce an energy discharge, but produced enough of a temporal paradox to allow a reaper to enter the church in which they were sheltering. (TV: Father's Day)
Similarly, different versions of Amy Pond (or the Amy Pond Ganger) touched on at several occasions. Older Amy put her hand on the head of younger Amy near the Pandorica, during total event collapse. (TV: The Big Bang) Amy also remembered an older version of herself replacing an ice cream cone she had dropped. She did not mention any unusual effects. (TV: Good Night) Two incarnations of adult Amy (or possibly her identical Ganger), approximately one minute apart from the other, touched each other flirtingly, within/outside the TARDIS (as the two concepts were the same at the moment), with no discharge. (TV: Time) While she was trapped in a facility where time was compressed by great temporal engines, an older version of Amy interacted with, but did not physically touch, a younger version of herself. (TV: The Girl Who Waited)
During an anomaly intentionally created by the the Doctor's TARDIS to annoy Clara Oswald, two versions of a time-looped Clara stated they were forced to share a bed together. Again, no negative effects were indicated. During the same incident, two versions of Clara brush past each other. (HOMEVID: Clara and the TARDIS)
The First Doctor took a later version of small boy Robert back in time, to replace Robert's terminally ill twin brother. The two versions of Robert presumably spent a number of years together without triggering either the Blinovitch Effect or generating a stronger temporal paradox. (PROSE: The Little Drummer Boy)