TARDIS Index File

Causal nexus

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A causal nexus, (TV: Logopolis) also called a time-space nexus, temporal nexus point, causal nexus point, nexus point, or just nexus, was a place in space and time that was malleable, (PROSE: Remembrance of the Daleks) points in the space-time continuum that were very rare and hard to access. (PROSE: Invasion of the Cat-People)

Where time would normally be able to resist or absorb minor changes, the Third Doctor noted that some locations in space and time were temporal probability nexuses where multiple strands of causality were exposed and weak, and the smallest alteration could produce aberrant loops of existence or even new alternate timelines. (PROSE: The Eye of the Giant)

As related to cause and effect, i.e. causality, nexus points often served as areas for potential anomalies, since the Fourth Doctor stated that every point in time had its alternative. (TV: Pyramids of Mars)

In time Edit

Causal nexuses existed within time fissures, which were created all the time. Though not visible, they could be sensed by time sensitives, and larger events could create fissures where time tracks diverged from the nexus point, allowing for travel to parallel universes. (AUDIO: The Wreck of the Titan)

The Doctor's TARDIS became caught in a spatio-temporal causal nexus point when it hit a bump in the time track, generated by the Daleks of an alternate timeline using a time corridor to pull the Fifth Doctor into their future. (AUDIO: The Mutant Phase)

The causal nexus divided when Nyssa changed history, causing the universe to exist in two quantum states and releasing blinovitch energy. When the time paradox was corrected with another paradox, the Fifth Doctor became the causal nexus as the paradox resulted from knowledge he would claim not to know in his personal future. (AUDIO: Prisoners of Fate)

In keeping with this, the "Wenley Moor Affair" was a crucial nexus-point in Earth's time stream because countless futures could diverge from that moment into alternate realities. (COMIC: Final Genesis)

The Sixth Doctor detected a temporal nexus point which turned out to be Evelyn Smythe, whose ancestors were slowly disappearing from history. (AUDIO: The Marian Conspiracy)

The planet Chronos in 3286 was a nexus point which could have led to the creation of the Cyberverse. (WC: Real Time)

The temporal period surrounding 1941 Earth was a crucial nexus point in the planet's development, and any alternations, such as killing Hitler, would disrupt the Web of Time. (COMIC: Me and My Shadow)

Rose Tyler, having travelled to Donna's World, refused to reveal her name. She stated that "one word in the wrong place can change an entire causal nexus". (TV: Turn Left)

When asked why he couldn't just take the TARDIS back to the previous day, the Tenth Doctor recited, as if by rote, "I can't go back within my own timeline. I have to stay relative to the Master within the causal nexus." He earlier called the same set of events a convergence. (TV: The End of Time)

While discussing changing her personal past, Older Amy Pond capped a list comprised of destiny and causality with the nexus of time itself, a structure of causal nexus points that described or defined time. However, at the time she was referencing changing her own recent personal history from within a stable temporal anomaly that was generated artificially. (TV: The Girl Who Waited)

In space Edit

Causal nexuses seemed to exist as actual structures of the universe, based on planets. Earth was widely recognised as one of the causal nexus points of the Mutter's Spiral. (PROSE: Cat's Cradle: Witch Mark)

Logopolis and its inhabitants ran the Charged Vacuum Emboitments that kept N-Space going past the point of collapse. When the Master stopped Logopolis, he caused the unravelling of the whole causal nexus. This released a wave of entropy that engulfed parts of the universe, killing them. (TV: Logopolis)

A nexus resided in the transjovian space near Jupiter, which the Hand of Omega reached using faster-than-light travel, after which traversing the nexus to reach Skaro in its own time zone by punching a hole in reality. (PROSE: Remembrance of the Daleks)

In both Edit

The particles of the Time Vortex could clump together at a nexus point. A TARDIS could hold onto a nexus point with mathematical anchors to resist the streaming delta flows. (PROSE: Cat's Cradle: Witch Mark)

The Seventh Doctor considered (and blamed) Earth as a "major time-space nexus" for the reason he was on Earth at certain times and the coincidences that came from that. These included him being in Mesopotamia in the time of Gilgamesh (PROSE: Timewyrm: Genesys) and being in Ife during the 10th century. In the latter travel, there may have been static electricity involved which made the Yoruba believe he was Shango, the thunder god. (PROSE: Transit)

The Edifice's interior dimensions were mapped onto its exterior, making it the same size inside as outside, cancelling its dimensional transcendence. This also caused it to become a nexus point, affecting past and future events along the causal pathways, generating temporal anomalies in the resulting temporal pulses. (PROSE: The Ancestor Cell)

Outside time and space Edit

A hyper reality nexus was created by Godwanna to access hyper reality and absorb all the energy she created from destroying Earth in 1994. (PROSE: Invasion of the Cat-People) There were points in the universe where parallels collided, where the Parallel Sect created a reality web threaded through the whole infinity of the universe. (AUDIO: The End of the Line)

Behind the scenes Edit

The term "temporal nexus point" first appeared in FASA's The Doctor Who Role Playing Game, but was not used in a canon story until The Marian Conspiracy.

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