sentences:  The story involved the TARDIS alerting the Doctor to the fact that a regeneration is in progress nearby, suggesting the presence of a fellow Timelord.The Doctor instead find the elite of the Doomwraiths emerging, reconstituted, as shimmering metal columns with many moving strips and a deadly purpose.The Wraiths find that human evolution has failed, and mankind has not taken on their form; they will thus release a plague to destroy humanity, relocate the missing section of genetic code and repopulate Earth themselves.