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A time ram was what happened if two TARDISes attempted to occupy exactly the same time and space. The resulting paradox would destroy both TARDISes and cause extreme spacio-temporal destruction in its wake. The fate for those caught in a time ram was what the Third Doctor considered tantamount to "extinction" and "total annihilation". (TV: The Time Monster) A move had an inevitable consequence: the complete and utter destruction of both TARDISes. The outer plasmic shells ruptured, the conditional pathways were aborted, the eleven relative dimensions of space-time evaporated. (PROSE: The Quantum Archangel)
According to the Fifth Doctor, a time ram caused by two TARDISes materialising in the same place would cause a black hole large enough to destroy an entire universe. (TV: Time Crash)
It could be narrowly avoided by a TARDIS materialising within another. (TV: The Time Monster, Logopolis, Time Crash)
As the Master and Krasis departed for Atlantis, the Third Doctor made an attempt to materialise his TARDIS inside of the Master's TARDIS with precise control over the frequency and time setting on his own TARDIS. He feared an imprecise measurement would make him place the time setting too low and miss the Master's TARDIS entirely. The other danger was setting the time too high, which would cause a time ram. He explained the lethal repercussions to Jo Grant, warning her that she had boarded the TARDIS at her own risk on this trip, after she had insisted to come along with him. The Doctor successfully materialised his TARDIS inside of the Master's, but accidentally allowed the Master's TARDIS to end up inside of his as well, causing both TARDISes to be snared inside each other. This standoff was eventually broken by force.
When the Master trapped Jo inside his TARDIS as Atlantis fell apart while Kronos rampaged, the Doctor threatened to send the Master into time ram — even though it would kill them both and Jo — to prevent him escaping with the Crystal of Kronos, which would allow him to dominate space and time forever. The Master called his bluff, realising he wouldn't kill Jo. However, Jo used the controls herself to cause a time ram. They were all saved by Kronos, who brought them into its dimension. (TV: The Time Monster)
Straxus used a time ram to force the Master's TARDIS out of the Vortex to attempt to erase him from existence. (AUDIO: The Threshold)
When Magnus Greel's time cabinet was being drawn out of its zygma beam between the years 5000 and 1872 to materialise in 1935, the Fourth Doctor and Romana I risked triggering a Time Ram to prevent the creation of an alternate timeline and ensure Greel arrived in the past to be defeated in London in 1889; by materialising the TARDIS where the Time Cabinet was trying to arrive, they forced the Cabinet to return to its original path as the location it was trying to arrive at was already occupied. (PROSE: The Shadow of Weng-Chiang)
When the Nine attempted to use a complex temporal rupture to essentially trap all of Earth's history in a private time vortex that he could use to plunder Earth's riches as he wished, the Fifth Doctor forced him to withdraw by threatening to time ram the Nine's vault. (AUDIO: Relative Time)
The Sixth Doctor performed a time ram against the remains of Iris Wildthyme's TARDIS at the centre of a dimensional nexus. Local conditions limited the effects to merely eliminating some possibilities from reality, but the force was still enough to destroy the rest of Iris' TARDIS. (AUDIO: The Wormery)
The Profane Virus of Rassilon was a theoretical computer virus that would force a TARDIS to Time Ram itself mere nanoseconds in its own past; the Master infected TOMTIT with nanobots that would infect the Doctor's TARDIS with the virus when the Doctor linked TOMTIT to the TARDIS, but Paul Kairos- the mortal identity of Kronos- was able to purge the nanovirus into the higher dimensions and allow the TARDIS to divert its past self before the time ram completed. (PROSE: The Quantum Archangel)
The Seventh Doctor attempted to perform a time ram against the Timewyrm in order to destroy her, but she escaped into the Time Vortex. (PROSE: Timewyrm: Genesys)
The Seventh Doctor time rammed his own TARDIS using an alternate version of it to release energy to destroy a divergent timeline. He believed his original TARDIS was destroyed, (PROSE: Blood Heat) however it survived due to a Fortean Flicker displacing it just before its destruction. (PROSE: Happy Endings)
The first eight Doctors time rammed their TARDISes against the Master's TARDIS in order to defeat him in a pocket dimension where he had framed them by using a conceptual bomb which was erasing the Doctor's timeline. (AUDIO: The Light at the End)
When the War Doctor materialised into the Battle TARDIS of Partheus to rescue him, the latter was afraid their TARDISes could time ram and annihilate each other. (PROSE: Engines of War)
Other time-controlling species were also able to utilise time rams. The Daleks mercilessly used a time ram against a factory default TARDIS and the Eighth Doctor's TARDIS when its defences were removed. (AUDIO: Tangled Web, X and the Daleks)
The Eighth Doctor was concerned that materialising his TARDIS on Caleera's could cause a time ram. (AUDIO: Scenes From Her Life)
Knowing that the repercussions could be catastrophic for both ships, the Tenth Doctor rammed an imitation of the TARDIS in the Time Vortex in an attempt to save Cindy Wu. This caused both ships to crash-land in what the Doctor described as ancient China. (COMIC: Sharper Than a Serpent's Tooth)