William Abberton William Abberton , or Nimrod , was the head of the Forge from its creation to its fall . Biography . On 14 October 1914 , Abberton was at the Forge , experimenting on humans with a vampire virus . The vampires overpowered their creator and escaped . Abberton was mortally wounded and took the drastic step of using the Twilight formula to save his life , becoming a vampire . ( AUDIO : " No Man ' s Land " , " Project : Twilight " ) Abberton took the codename Nimrod and , enhanced with cybernetics and specialised weaponry , sought to hunt the vampires down and destroy them . During this time he met the Sixth Doctor and Evelyn Smythe , who stopped him from killing the vampire Cassandra Schofield . ( AUDIO : " Project : Twilight " ) Between 2002 and 2004 , Nimrod headed Project Valhalla , trying to scavenge alien technology from a crashed alien spaceship in Lapland . The mission turned into a disaster and the area had to be sterilised when the ship turned out to be a prison for a world - killing , blood - formed entity known as Nyathoggoth . After Project Vahalla , Nimrod had Crichton , the Deputy Director of the Forge , assassinated so Nimrod could take it over . ( PROSE : " Project : Valhalla " ) Nimrod encountered the Sixth Doctor again in late 2004 , while aggressively acquiring a Huldran spacecraft , he also initiated Project Lazarus : an attempt to replicate his regeneration s . Although the Doctor escaped , Nimrod had enough DNA information to create a clone of him ; it was unable to regenerate , but had enough of the Doctor ' s attributes to be hired as a scientific advisor . When the Huldrans began attacking the Forge in retaliation , Nimrod had the clone brainwashed to believe he was the Doctor , had been stranded on Earth , and was assisting them to prevent the Huldrans destroying Earth . By 2007 , the constant Huldran attacks and the arrival of the Seventh Doctor caused several key Forge members to realise the truth of the clone ' s nature . While the Doctor solved the Huldran situation , the clone activated the Forge base ' s self destruct program . ( AUDIO : " Project : Lazarus " ) In the 2020s , Nimrod remotely observed Iris Wildthyme ' s attack on a temporary Forge base in Weston - super - Mare . Iris talked directly into a camera to inform Nimrod of the damage she had caused to Oracle . ( PROSE : " Project : Wildthyme " ) By 2025 , he had begun using the name William Abberton again . Abberton tried to turn the Doctor ' s companion Hex against the Doctor by revealing the Doctor ' s involvement with the death of Hex ' s mother , Cassandra Schofield . After the Doctor initiated the self destruct of the Forge ' s beta base , Abberton was seemingly disintegrated by an alien device . ( AUDIO : " Project : Destiny " ) However , Nimrod had managed to survive vaporisation , and , in a desiccated , near - dead state , had been connected to the main Forge computer , Oracle and was now the new leader of the Forge . The Doctor left a syringe containing the Twilight cure beside Nimrod , which would cure his vampirism . However , the vampire DNA was the only thing that kept Nimrod alive , and taking the Twilight cure would cause his death . Depending upon his decision , the fate of Nimrod and the Forge was unknown . ( PROSE : " Twilight ' s End " )