Time Destructor The Time Destructor was a unique superweapon developed in the 40th century . Functions . A small device , easy to carry , the Time Destructor would only work once , exhausting its taranium core . It could accelerate or reverse the flow of time with devastating effect . It was controlled by a switch . The Doctor ' s TARDIS offered immunity from the distortions to the time flow . Once the Time Destructor had burnt itself out , its effects reversed for the survivors , though not for those killed by it . ( TV : " The Daleks ' Master Plan " ) History . From 3950 until circa 4000 , an operation on the planet Uranus mined an emm of taranium , enough to power the weapon . The Dalek s secretly obtained the taranium . They wanted to use the Time Destructor in their invasion of the Solar System and Earth in particular . ( TV : " The Daleks ' Master Plan " ) The Daleks kept the Time Destructor in a secret city on Kembel , reputedly the most dangerous planet in the universe . The First Doctor stole the taranium core and created a non - functional replica of it . Mavic Chen and the Supreme Dalek attempted to test the weapon on Trantis . They found that , without a functional core , it would not work . Eventually , after chasing the Doctor and his companion s through time and space , the taranium core was retrieved by the Daleks and re - installed . The Dalek Supreme ordered the Time Destructor placed in the flagship of the Dalek fleet . Meanwhile , the Doctor returned to Kembel , stole the Time Destructor and activated it in order to destroy the Daleks and their base . Fleeing the complex , they activated the Destructor . Time on Kembel began to advance at unnatural speed . This affected the vegetation , which slowly began to die and disappear . The Doctor himself and his human companion Sara Kingdom did likewise . The Daleks themselves remained unaffected . Sara aged to death , decayed into a skeleton and died as the planet turned into a lifeless wasteland . With the reversal of the Time Destructor , the Daleks began to feel the effects , and reverted to helpless mutant embroyos without their shells . With the exhaustion of the taranium core , the Time Destructor turned into rusted junk . ( TV : " The Daleks ' Master Plan " , PROSE : " The Mutation of Time " ) this event triggered the Great War . ( PROSE : " The Evil of the Daleks " ) The Daleks used the Time Destructor during the Last Great Time War . The weapon destroyed the Nestene homeworld and several other planets . Its shockwave affected systems from Grantaginus to Mellandrova , and from the Farflung Rift to the Wolf ' s Heart Nebula . The Eighth Doctor ' s TARDIS was caught in its temporal wave . ( PROSE : " Natural Regression " ) Later in the War , the Time Lords used the Time Destructor on a stealth mission to destroy the Dalek fleet . The War Doctor replaced the Time Lord soldiers charged with activating the weapon , and detonated it himself . The Time Destructor succeeded in destroying most of the Dalek fleet . ( AUDIO : " The Innocent " ) In a parallel universe , the Time Lords utilised time dreadnought s armed with multiple time destructors , which were miniature Eyes of Harmony . ( PROSE : " The Quantum Archangel " )