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When their work was undone by the Third Doctor , the Daleks pursued the First Doctor in an attempt to neutralise his "future intervention". [ 2 ] It is further noted that, since the Fourth Doctor inadvertently changed Dalek history so that Davros survived, this event would have occurred vastly differently if it happened at all in the new timeline . [ 3 ] Giving no precise date for the Cyberman attack on the Wheel , The Discontinuity Guide placed it to anywhere following the 2070 Moonbase...