Martha Jones

Dr Martha Jones worked as a medical student at the Royal Hope Hospital in London when she first met the Doctor. Eventually, after deciding to leave him, the Doctor ensured that she would find work with UNIT.

Family
Martha's parents were France and Clive Jones. She had an older sister, Letitia "Tish" Jones and a younger brother, Leo, who lived with his girlfriend and had a child. On the day that Martha first met the Doctor, her family had a row at her brother Leo's 21st birthday due to Clive insisting on bringing his young girlfriend Annalise, much to his estranged wife's disgust. (DW: Smith and Jones) Martha's cousin, Adeola Oshodi worked at Torchwood 1 before her death (DW: Army of Ghosts).

Joining the Doctor
The twenty-three-year-old Martha was working at Royal Hope Hospital under Mr Stoker when she encountered the Doctor. She encountered him on the street, then gave him a cursory physical (and learnt that he had two hearts) and later helped him defeat the Plasmavore "Florence Finnegan" when the hospital was transported to the Moon by the Judoon. That evening, she joined the Doctor on his travels. The Doctor insisted, however, that he had not brought Martha aboard the TARDIS as a replacement for his previous companion, Rose Tyler. (DW: Smith and Jones)

After returning home in The Lazurus Experiment, the Doctor allowed her to stay on board the TARDIS. He gave her a mobile phone upgrade and a TARDIS key (DW:42).

Time away from the Doctor
When the Master took over Earth, Martha pretended to make a weapon that would kill the Master. She said that she had witnessed the Toclafane burn the islands of Japan. She spent a year on earth telling everyone to think of the Doctor at a specific time so that the Master could be defeated. This plan worked and the Master was shot by his wife Lucy Saxon. As a result of the destruction of the Master's Paradox Machine, only Martha, her family, and everyone else who was on board the Valiant remembered that year spent with the Master. She decided she wanted to go and complete her medical studies, but gave the Doctor her enhanced mobile phone, saying that she might want to return to travelling with him in the future. (DW: Last of the Time Lords)

Joining UNIT and short tenure with Torchwood
The Doctor put in a good word for Martha at UNIT. At the request of Captain Jack, As a UNIT she visited Torchwood 3 in Cardiff, where she became embroiled in their investigation of a private medical organization called The Pharm. Torchwood sent her into the Pharm as an undercover agent, but during the course of her investigation she was discovered and captured and the Mayflies were put into her body. Owen Harper saved her life using an alien surgical device but Alan Copley killed him. Just as Copley was about to shoot Martha he was shot in the head by Jack Harkness. (TW: Reset) Martha witnessed Owen's return from the dead as an undead being means of the resurrection gauntlet and gave him a posthumous physical. "Death", a force possessing Harper aged Martha into an old woman. After the Death being vanished, she reverted to normal (TW: Dead Man Walking) She mended Harper's injured hand after, in a fit of self-destruction, he deliberately wounded it, after Jack decided to relieve him of duty at Torchwood. When Owen Harper was promoted back to Doctor, she left for UNIT, a few days after she had joined on (TW: A Day in the Death). She didn't go to Gwen Cooper's wedding because of work (Torchwood website).

Back at UNIT, her boyfriend, Thomas Milligan and Martha got engaged (DW: The Sontaran Stratagem), though he left Britain for a while to go to Africa (DW: The Poison Sky)

Reunion with the Doctor
Martha called the Doctor just as she, together with UNIT, was about to attack the ATMOS factory which secretly formed a key part of a Sontaran invasion plan. At the time, she worked under the by-the-book Colonol Mace who was in charge of the operation. Later that day she warned Donna Noble to keep her family safe because of what had happened to her own family at the hands of the Master. A few minutes later she was kidnapped by two solders under Sontaran control and taken to her to a cloning pool, where they started copying her body. She then was put to sleep but kept alive as a her clone was about to aid the Sontarans and needed access to her memories. (DW: The Sontaran Stratagem) Martha's clone died soon after the Doctor rescued the real Martha. While chatting with the Doctor and Donna inside the TARDIS after the defeat of the Sontarans, Martha turned down the Doctor's offer to let her travel again with him. As soon as she had made her refusal unknown force took control of the ship and dragged it into the Vortex (DW: The Poison Sky).

Other information
The length of time Martha spent travelling with the Doctor during her first adventures in the TARDIS has never been defined, but is known to include approximately three months spent in 1913 (DW:Human Nature / Family of Blood), a year in an alternate timeline (DW: Last of the Time Lords), and an undefined period trapped in 1969 that was long enough to require her to find employment in order to support the Doctor (DW:Blink).

Key Life Events

 * Martha meets the Doctor and decides to go traveling with him (DW: Smith and Jones)
 * On an Earth ruled by "Harold Saxon" and his servants, the Toclafane, Martha spends a year fighting the occupation and ensuring the Doctor's victory. She meets Thomas Milligan (DW: Last of the Time Lords).
 * Martha decides to leave the Doctor and strike out on her own (DW: Last of the Time Lords).
 * Martha joins UNIT as a medical officer (Mentioned TW: Reset)
 * Engagement to Thomas Milligan (Mentioned DW: The Sontaran Stratagem)
 * Reunion with the Doctor and first meeting with Donna Noble DW: The Sontaran Stratagem). Martha once more joins the Doctor in his travels when the TARDIS gets diverted from Earth with her inside it (DW: The Poison Sky)