President of Earth The President of Earth , or President of the World was a title held by one person at a time , under special circumstances during the 21st century , on regular basis by at least the 26th century , continuing on at least into the 41st . Conception . The position of Earth president originated in the early 21st century , before the establishment of a unified Earth government . Organised by UNIT , an international agreement was made on incursion protocols . Under this agreement , in the event of a full - scale invasion , a President of Earth with complete authority over every nation state was immediately inducted . It was decided the only practical candidate for this role was the Doctor . As Earth president , the Doctor would essentially be the Chief Executive Officer of the human race and the Commander - in - Chief of every army on Earth , under whom all world leaders would await instructions . This induction was performed during an invasion of Earth by an army of Cybermen converted from the dead by . Having stumbled upon the invasion , the Twelfth Doctor was captured by UNIT and taken aboard their presidential aircraft , Boat One , where he was inducted as Earth president . ( TV : " Death in Heaven " ) The Doctor continued referring to himself as the President of the World after this event , though Bonnie noted he did not like it . He also made use again of the presidential aircraft , but purely for " poncing about in " . ( TV : " The Zygon Invasion " ) The Doctor later became President of the World shortly before the Monks invaded the planet . ( TV : " The Pyramid at the End of the World " ) Earth government . Both Earth and the broader Earth Empire , and later the Earth Alliance were ruled by this elected figure . However , at least some of the later human empires were instead headed by emperor s . ( TV : " Frontier in Space " , " Nightmare in Silver " ) He or she did not , however , have full control over every aspect of the Empire . In purely military matters , the president was unable to overrule the head of the military without the backing of the Earth Senate . Also , the President of Earth had limited control over the affairs of the planets such as Sirius IV : dominions were semi - autonomous and the president had no control over their domestic affairs . ( TV : " Frontier in Space " ) The president led a democracy , and had to submit to periodic election cycles in which various candidates argued their positions in order to win popular approval . Earth Security was a shadowy police organisation which could hold troublemakers without trial . In extreme cases , the president had the power to remove political rivals to the Lunar Penal Colony for the rest of their lives . The position thus had elements of democracy and dictatorship about it . ( PROSE : " Doctor Who and the Space War " ) History . In the early 21st century , the Twelfth Doctor was temporarily appointed President of Earth during the invasion of Cybermen . ( TV : " Death in Heaven " ) He was made president again during a Hyperion invasion , ( COMIC : " The Hyperion Empire " ) and a Zygon uprising . ( TV : " The Zygon Invasion " ) When the Monks appeared in a potential warzone , the Doctor was made President of Earth once more to deal with the threat . However , after being given a vision of a world - ending catastrophe , the world leaders stopped listening to him . As he saved the world , the Doctor commented to Bill Potts " President of Earth indeed . " ( TV : " The Pyramid at the End of the World " ) By the 2190s , after the 22nd century Dalek invasion of Earth , an Earth Council led by a president was established . ( AUDIO : " An Earthly Child " ) In 2540 , President Dora came under great pressure to declare war on the Draconian s , especially from General John Williams , but was able to maintain peace thanks to the Third Doctor . ( TV : " Frontier in Space " ) Earth ' s Presidency was based in the White House in Washington DC during the Orion War of the early 26th century , when Duncan Levinson was President of Earth . ( AUDIO : " Scorpius " ) Upon Levinson ' s death , Karen Brett took Presidential office . ( AUDIO : " Fear " ) In the early 27th century , Earth was governed by five co - existing Presidents of Earth , among them the President of Africa and the President of the Americas . ( COMIC : " Masters of the World " ) A clone of Bernice Summerfield became President of Earth in the 27th century . ( AUDIO : " The Final Amendment " ) By the 40th century , the government of Earth was instead headed by a Guardian of the Solar System . ( TV : " The Daleks ' Master Plan " ) However , 41 years after Mavic Chen ' s demise in 4000 , the title of Earth ' s head of state was again President of Earth . In the year 4041 , the current President was still based in the Oval Office of the White House , where he was secretly under the control of the Klytode until the Tenth Doctor freed him . ( COMIC : " Return of the Klytode " ) Sheridan Moorkurk was elected to the presidency unexpectedly due to a surge in the protest vote against the Conglomerate . ( AUDIO : " War Against the Laan " ) " EP One " was the President ' s personal jet . ( AUDIO : " War Against the Laan " )