Josephine Jones (née Grant) was the deuteragonist in seasons 8 to 10 of Doctor Who. Jo travelled with the Third Doctor when she was employed by UNIT after the departure of Liz Shaw. Initially a lab assistant, she accompanied the Doctor during occasional missions for the Time Lords and after his exile on Earth was lifted.
Eventually, she left UNIT to marry Clifford Jones, who managed to receive UN funding for numerous progressive scientific studies.
She was portrayed by Katy Manning.
Jo was born in 1951. As a child, she would go to the seaside with her family. Her Grandfather would always spoil her with ice cream behind her parents' backs. When Jo was 7 years old, her grandfather died.
Jo attended a grammar school and took an A-Level in General Science, but apparently, she didn't pass.
One day, when Jo was visiting her uncle, she saw a car following her bus, leading to a pursuit. After a short chase, she found herself being pursued by insect-like creatures in the countryside, but she was saved by a grey-haired man wearing a velvet suit. Unfortunately, she was later captured by the cabby who abandoned her earlier in the chase. She soon overpowered the cabby and demanded to be taken to whoever was behind all this, who it turned out was actually her uncle. These experiences were apparently all a test for her to determine her fitness for UNIT, which she passed.
In Terror of the Autons, Jo met the Doctor for the first time, but he initially thought she was the tea lady, and she accidentally ruined his experiment. Though the Doctor initially rejected Jo as scientifically incompetent, the Brigadier correctly asserted that what the Doctor needed was "someone to pass you your test tubes and tell you how brilliant you are". Her first assignment was revolved around the Master's scheme to use the Nestene Consciousness and the Autons to destroy Earth. Even though Jo was hypnotised by the Master into bringing a bomb into UNIT HQ in an attempt to blow up the Doctor, she proved her worth to him and they quickly became almost inseparable.
When the Time Lords allowed the Doctor to go on missions for them, Jo went with him in Colony in Space, with her first trip being on the planet Uraxeus, to stop the Master claiming the Doomsday Weapon. While there, she was captured by the IMC, but escaped with the help of fellow captive David Winton. She was recaptured by the IMC, and was later taken prisoner by the primitive Uxarieans and taken to their city, but was rescued by the Doctor, and helped him defeat the Master.
In Day of the Daleks, Jo and the Doctor were called to investigate Auderly House which was apparently haunted by ghosts, which were actually a group of time-travelling guerrillas from an alternate future ruled by the Daleks. Jo wound up being brought into the 22nd Century where she met the Controller. The guerrillas helped the Doctor and Jo escape and return to the 20th century so they could prevent World War 3, which was caused by Shura's misguided attempt to kill Sir Reginald Styles. Jo helped the delegates of the Second World Peace Conference evacuate before the Daleks could arrive, leaving them to be destroyed when Shura blew up the house with himself and them still inside.
In The Green Death, Jo went to Llanfairfach in Wales to meet with an activist named Clifford Jones so she could help him protest Global Chemicals' approval of more petrol which would cause more pollution. During Jo's short stay in Llanfairfach, she ended up falling in love with Cliff, eventually resigning from UNIT to marry him. The Doctor left the wedding party after giving Jo a blue crystal that he found on Metebelis 3.
The Sarah Jane Adventures
In The Death of the Doctor, Jo attended a funeral for the Doctor along with her grandson, Santiago. It was here where she met Sarah Jane Smith, another companion of the Doctor's. Both of them were really doubtful that the Doctor was really dead, and they were proven right when they found out that the Doctor was stranded on a deserted planet by the Shansheeth. Jo and Sarah Jane managed to foil the Shansheeth's plan to steal the Doctor's TARDIS and then went to Norway with Santiago.
Farewell, Sarah Jane
Jo Grant was among several of the Doctor's companions who attended the funeral of Sarah Jane Smith. Toward the end of the service, she recalled her memories of Sarah Jane Smith to Luke, Clyde and Rani, and also explained to them that the Doctor would not attend because he would find the memorial too saddening.
- Jo is depicted as reuniting with the Eighth Doctor in the novel Genocide, where she is depicted as having a son called Matthew, and having split from Cliff. Death of the Doctor instead paints the couple as happily married, as does most spin off stories after Death of the Doctor. While the writer, Russell T Davies, was aware of Jo's fate, he deliberately decided to paint a happier picture of Jo's later life.
- In universe, Jo's different life can be explained due to the Eighth Doctor's contradictory timeline.