Margaret Thatcher Margaret Thatcher , neé Roberts , ( PROSE : " The Assassin ' s Story " ) was the Prime Minister of the United Kingdom from 1979 ( TV : " Tooth and Claw " ) until at least 1987 . ( TV : " Father ' s Day " ) According to one source , her predecessor was James Callaghan of the Labour Party . ( AUDIO : " The Oseidon Adventure " ) According to the Eighth Doctor , Thatcher served between Shirley Williams and John Major . ( PROSE : " Interference - Book One " ) Biography . In March 1965 , Lady Catherine Waverly believed that Thatcher , then in opposition , already showed a great deal of promise while Sir Toby Kinsella predicted that she would make her mark . ( AUDIO : " Manhunt " ) She was the leader of the Conservative Party . Her party won the general election on 9 June 1983 in a landslide victory over Labour . ( AUDIO : " Rat Trap " ) In 1984 , London Zoo had a female Tibetan Yeti named Mahamaya , which was successfully bred with a male from Peking . Their offspring was named Margaret after Thatcher , whom she bit at a photocall . ( PROSE : " Downtime " ) In the same year , the Kin used Thatcher as a disguise . ( PROSE : " Nothing O ' Clock " ) The Seventh Doctor , Roz Forrester and Chris Cwej lived for a short time in a housing estate in 1987 , during her time in power . ( PROSE : " Damaged Goods " ) In 1987 , posters from the " Socialist Worker " read , in block letters , " No Third Term For Thatcher " . ( TV : " Father ' s Day " ) The Sixth Doctor served as an advisor or consultant to her . He referred to her disdainfully as " that woman " and admitted that she terrified him . ( AUDIO : " The Ultimate Adventure " ) His tenth incarnation showed further distaste for her . ( TV : " Tooth and Claw " ) In contrast to her India n counterpart and contemporary Indira Gandhi , Peri Brown did not consider her to be an effective female leader . ( AUDIO : " The Eye of the Scorpion " ) An android replica of Thatcher was the last of a succession of android British Prime Ministers from Robert Walpole created by Tasq . ( PROSE : " Time Wake " ) The Twelfth Doctor briefly mentioned Thatcher as a possible candidate to the Landlord when asking him who the current Prime Minister was . ( TV : " Knock Knock " ) Alternative timeline . In an alternative timeline , Thatcher was assassinated by her fellow Conservative politician Heathcliffe Bower in 1984 . However , the proper timeline was restored by the Fifth Doctor . ( PROSE : " The Assassin ' s Story " ) Behind the scenes . Continuity . The reference to a female prime minister in " Terror of the Zygons " was an ad - lib by Nicholas Courtney , according to the DVD commentary for " Frontier in Space " . It could suggest that in the " Doctor Who " universe either Thatcher was elected PM earlier than in real life or that , as intended by the production team , the UNIT stories took place in the near future . The BBC ' s Doctor Who Classic Series website , however , claims that the Prime minister was , with Labour taking over from a collapsing Jeremy Thorpe government . In real life , Thatcher resigned as prime minister in 1990 , but this has yet to be confirmed in the continuity of the franchise . Satirical portrayals . Margaret Thatcher inspired some unflattering portrayals in the Whoniverse . The misguided dictator Helen A from " The Happiness Patrol " is widely supposed to be based upon her , whereas the villainess Rehctaht , the female villain of " Turlough and the Earthlink Dilemma " , has the name Thatcher , spelled backwards . A villainess named " Thatchos " ( a Cyber - Leader in a fright wig ) appeared in a Doctor Who parody on " The Lenny Henry Show " .