Luke Rattigan was a gifted and ambitious teenager who developed the ATMOS car technology in cooperation with the invading Sontaran race. He was the founder of the Rattigan Academy, a school for geniuses. However, he developed an irrational hatred for people he deemed less intelligent than him and willingly committed global treason in order to reconstruct humanity in his own perfect vision.
Biography
Early life
Luke attended primary school between 1990 and 1992. (TV: The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).) Identified as gifted in mathematics and science, he was moved to a specialist school, where he proved able to understand elementary quantum physics. (PROSE: The Time Traveller's Almanac [+]Steve Tribe, BBC Books (2008).) He was already developing professional-level software by the age of 10, and at the age of 11 was offered a job by International Electromatics; he turned it down, instead choosing to work on a project of his own. (PROSE: The Secret Lives of Monsters [+]Justin Richards, BBC Books (2014).) At twelve years old, he invented the Fountain Six search engine, which made him a millionaire almost overnight. (TV: The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).)
ATMOS and the Rattigan Academy
In his later teens, feeling misanthropic and unappreciated by society, he worked with the Sontarans to develop the "Atmos" car device, which effectively eliminated all CO2 emissions of a car. Unbeknownst to its unwitting users, ATMOS would also poison the atmosphere, allowing the Sontarans to build a clone army to continue their war against the Rutans.
In September 2005, Rattigan was given an IQ rating of 174 (exceptionally gifted (PROSE: The Time Traveller's Almanac [+]Steve Tribe, BBC Books (2008).)) by Mensa experts, pioneering a new advanced IQ rating system. (TV: The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).)
In 2006, he used his wealth to purchase a mansion on Templeford Road (PROSE: The Time Traveller's Almanac [+]Steve Tribe, BBC Books (2008).) in Richmond (TV: The Sontaran Stratagem [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).) in the Greater London Borough of Richmond. There he founded the Rattigan Academy, established to make advance in science and technology, (PROSE: The Time Traveller's Almanac [+]Steve Tribe, BBC Books (2008).) where he would work and reside. (TV: The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).)
After having set up Rattigan Academy, he was interviewed by Jeremy Fitzoliver for Metropolitan. (PROSE: The Secret Lives of Monsters [+]Justin Richards, BBC Books (2014).)
The Tenth Doctor arrived when the then-eighteen-year-old Rattigan was running Rattigan Academy, teaching similarly gifted teenagers handpicked by Rattigan. (TV: The Sontaran Stratagem [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).) Unbeknownst to any of them but Luke, the Sontarans had promised to give them the nonexistent planet "Castor 36" (renamed "Earth-Point-Two" by Rattigan) to build a new world after the poisoning of Earth. (TV: The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).)
The Sontarans activated "Atmos" which had been installed into 50% of the world's vehicles. The Atmos systems emitted a gas which would kill all humans for their cloning process. Clouds soon wrapped the whole planet. (TV: The Sontaran Stratagem [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).) Overcome by the thrill of war, Luke teleported from the Sontaran ship, where he'd been watching the gas enveloping the planet, back to his academy. He tried to convince his pupils to come with him to "Castor 36" to found their own civilisation (for which they had been developing super-advanced technology in their labs). Horrified by the disaster and taking Rattigan to be mad, they abandoned him and fled.
A dejected Luke returned to the Sontaran mothership and reported his failure. The Sontarans revealed they had had no plans to keep the students alive anyway; they had merely needed Luke and his pupils for the creation and installation of the Atmos systems. After that, their only plans for the students were to use them as target practice.
Devastated, Luke teleported back to Earth. He was met again by the Doctor, who told him to "do something clever with [his] life". The Doctor teleported to the Sontaran ship with a reversed atmospheric converter. He intended to blow up the Sontarans — and himself — if they refused to leave Earth alone. Taking the Doctor's advice, Luke reprogrammed the teleporter, switched places with the Doctor, and blew up the Sontaran ship just in time, killing himself and almost all of the Sontarans in there. (TV: The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008)., The Last Sontaran [+]Phil Ford, The Sarah Jane Adventures series 2 (BBC One and CBBC, 2008).)
Legacy
Despite Luke's treachery, the Doctor appeared to pity him and, to a degree, sympathize with him, recognizing his loneliness that derived as a side-effect from his exceptional intelligence. As such when Davros asked the Doctor to remember "How many have died in your name?" the Doctor recalled Luke among the others. (TV: Journey's End [+]Russell T Davies, Doctor Who series 4 (BBC One, 2008).)
By 2011, the Grey Archive had claimed the leftover Sontaran technology. When one of the cloning pools came back online, the first clone incorporated Luke's DNA, giving it a more human appearance and superior intelligence. (PROSE: For the Girl Who Has Everything [+]Dave Rudden, The Wintertime Paradox (2020).)
Personality
Even though Luke was brilliant (having an IQ rating of 174), he acted neurotically, in outbursts of unreasoning emotion. Luke lacked social skills. He believed all his students had been rejected from society for being intelligent and did not understand why they refused to join his vision to save the "ordinary" people they loved. He was very ambitious and callous towards people he felt did not meet his standard of intelligence, viewing the simultaneous deaths of 52 people via his own ATMOS system as amazing rather than horrible. He also viewed his home planet of Earth as a disappointment, stating that it was never big enough for him. He found the Doctor particularly annoying because of his cheeky attitude, his obviously superior intelligence and his use of tautology. Luke joined forces with the Sontarans because they seemed to appreciate his genius, leading him to commit global treason. When the Sontarans turned against him, Luke redeemed himself by sacrificing his life to destroy them. (TV: The Sontaran Stratagem [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008)./The Poison Sky [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008).)
Despite his actions and personality, the Doctor showed sympathy towards Luke, recognizing the boy's attitude and actions as being a result of intense loneliness brought on by his intelligence making him feel separate from the rest of society.
Behind the scenes
As revealed by writer Helen Raynor in the commentary for The Sontaran Stratagem [+]Helen Raynor, Doctor Who series 4 (BBC One, 2008)., Luke was named after Luke Marlow, a young Doctor Who fan she knew, and in fact that was his original surname, as well. Russell T Davies, however, preferred the name Rattigan.