Jo Grant Josephine Grant ( later Jones , 1951 - 2028 ) was a civilian employee of UNIT , whom the Brigadier assigned to the Third Doctor after the departure of Liz Shaw . Initially a laboratory assistant to the Doctor , she became a travelling companion to the Doctor during one - off missions for the Time Lord s , and after his exile on Earth was entirely lifted . Although she mostly knew the Doctor in his third incarnation she also had significant adventures with the Second and Eleventh Doctor s , and briefly saw the First Doctor on the TARDIS scanner . ( TV : " The Three Doctors " , " Death of the Doctor " ) She left UNIT , and therefore the Doctor , to marry Professor Clifford Jones , who at the time had received United Nations funding for a variety of progressive scientific studies . ( TV : " The Green Death " ) The path of their later lives was unclear . Some accounts stated that they got divorced . ( PROSE : " Genocide " ) Others held that they travelled the world together for years , leaving behind a legacy of environmental progressivism and protests — as well as an abundant number of children and grandchildren . ( TV : " Death of the Doctor " ) Biography . Early life . Jo Grant was born in 1951 . ( PROSE : " / Carpenter / Butterfly / Baronet " ) During her childhood , Jo used to holiday at the seaside with her parents , her uncle and her grandfather . Her grandfather , who smoked a pipe , always used to spoil her . He often bought her ice cream behind her parents ' backs , observing , " What ' s the harm ? Life ' s too short . " He died in 1958 when his granddaughter was seven years old . ( AUDIO : " The Mists of Time " ) As a child , Jo had " an army of gonk s and troll s " but even then she found dolls creepy . ( AUDIO : " The Doll of Death " ) She took an A - Level in general science , though she apparently did not pass . Nevertheless , she was accepted into employment at UNIT largely because of the influence of her uncle Jack Canning , who had a connection to the United Nations . ( TV : " Terror of the Autons " ) Life with the Doctor . Jo met the Doctor when was using the Nestene Consciousness to conquer Earth . Though the Doctor initially rejected Jo as scientifically incompetent , the Brigadier was correct in his assertion that what the Doctor needed was " someone to pass you your test tubes and tell you how brilliant you are " . 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 . ( TV : " Terror of the Autons " ) The Doctor and Jo watched a demonstration of the Keller Machine at Stangmoor Prison . Later , when the Doctor was called by UNIT to the World Peace Conference , Jo and Dr Summers were held hostage by Mailer and Vosper , two prisoners that helped took over the prison . The Doctor later joined her as a hostage . UNIT troops liberated the prison . The Doctor and Jo , aided by the rehabilitated prisoner Barnham , carried the Keller Machine to the site of the Thunderbolt missile to incapacitate the Master , preventing him from launching the Thunderbolt missile at the Conference . The Keller Machine was destroyed by the aborted missile , but the Master escaped , killing Barnham and reclaiming his TARDIS ' dematerialisation circuit . ( TV : " The Mind of Evil " ) The journalist James Stevens saw Jo at Stangmoor Prison and described her as a " small , mousy looking woman with a pleasant face . " ( PROSE : " Who Killed Kennedy " ) When the Master lured Axos to Earth , she was one of the first people to see their true form . It held her prisoner with Bill Filer and the Doctor . They escaped whilst the Master tried to turn Axonite against them . ( TV : " The Claws of Axos " ) When she first entered the TARDIS , the Time Lord s piloted it to the planet Uxarieus to stop the Master from using 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 Uxariean s and taken to their city , but was rescued by the Doctor . ( TV : " Colony in Space " ) After watching a TV programme about an archaeological dig in Devil ' s End , the Doctor and Jo visited the village . They found the Master there , trying to use the power of the Dæmon Azal who was buried in the Devil ' s Hump . UNIT finally captured the Master after Jo ' s act of self - sacrifice confused Azal into destroying himself . ( TV : " The Dæmons " ) The Doctor and Jo investigated " ghosts " at Auderly House . They were attacked by guerrillas from an alternate future ravaged by World War III and a Dalek occupation . While trying to break one of their time travel devices , Jo was taken to an alternate 22nd century . In her talks with the Controller , she unwittingly drew the guerrillas and the Doctor back to her era . The guerrillas helped the Doctor and Jo return to the 20th century and prevent World War III , which was originally started by the guerrilla Shura ' s misguided assassination of Sir Reginald Styles . At the Second World Peace Conference at Auderly House , Jo helped evacuate the delegates , undoing the damage when the house was destroyed by Shura with the pursuing Daleks inside . ( TV : " Day of the Daleks " ) One particular evening , Jo was dressed up , ready for a night on the town with Mike Yates . Her outfit proved to be lucky when she and the Doctor landed on the planet Peladon ( thanks to the Time Lords ' taking control of the TARDIS to have the Doctor arrange events to their liking ) . Jo was introduced as an Earth princess — Josephine , Princess of Tardis — and she was dressed appropriately . Only those of royal blood were allowed in the conference chamber . King Peladon was smitten and proposed marriage . In the time that she and the Doctor were on Peladon , Jo grew to like the king , but decided to return to her own planet . ( TV : " The Curse of Peladon " ) The Doctor and Jo decided to visit the Master in prison . Whilst there they discovered the Master had contacted the Sea Devil s , a race of underwater reptiles , who were a similar species to the Silurian s the Doctor met in the caves . The Master intended to start a war between Sea Devils and human ity . Jo stayed behind at the HMS Seaspite naval base while the Doctor tried and failed to negotiate a peaceful solution with the Sea Devils in their underwater base , as the Royal Navy attacked them with depth charges . After the Doctor escaped the base , the Sea Devils captured HMS Seaspite . The Master forced the Doctor to help build a sonar device that would awaken more Sea Devil bases . As the Doctor incapacitated the Sea Devils with the noise made by plugging the device improperly , Jo subsequently brought Captain Hart with her to get naval reinforcements to fight against the Sea Devils and recapture HMS Seaspite . Following the Master to the Sea Devil base , the Doctor blew up the Sea Devil base , preventing more bases from being activated , and stopping the war , although the Master escaped . ( TV : " The Sea Devils " ) Jo helped the Solonian s in their battle against persecution . She also alerted the crew of the " Hyperion " to the Marshal of Solos ' misdoings . ( TV : " The Mutants " ) Jo learnt well with the Doctor . When he was unwilling to execute the time ram , she completed the action . She realised why the Doctor was reluctant , but also saw the risk of not completing it . However , the Chronovore Kronos saw fit to spare her and the Doctor from their demise when she carried out the time ram , but not the Master . Kronos decided the Master would be punished with endless suffering for his actions geared toward controlling it . Jo thought the Master deserved his fate , until the Doctor made her question if she would condemn anyone to eternal torment , even the Master . She agreed with the Doctor to spare the Master and returned to Earth unharmed . The Doctor apologised for taking her to Atlantis , but she was actually glad to have gone on the journey with him after hearing a tale about his past on Gallifrey . ( TV : " The Time Monster " ) The Brigadier once asked her to record a report of a recent mission in order to keep up with her paperwork . She recorded an investigation into her friend who was acting strangely after buying a fusiliers jacket which contained the soul of Tommy Watkins . ( AUDIO : " Tales from the Vault " ) After the Doctor went missing after investigating The Scorchies Show , she ended up being on their show when she was caught entering the studio . She had to explain why she was there in a story and make something , which she called an anti - scorchie gone . She told the viewers of the show to switch over to another side to try and stop them from killing them at home . She helped the Doctor to create a reverse polarity generator to undo the signal that controlled the scorchies . ( AUDIO : " The Scorchies " ) When UNIT HQ was besieged by a force that even the Time Lords thought shouldn ' t exist , Jo travelled to a black hole to meet a Time Lord legend with her Doctor and the Second Doctor and was advised by the First Doctor . At the conclusion of this adventure , the Time Lords rescinded the Doctor ' s exile on Earth and restored his knowledge of operating the TARDIS and time travel . ( TV : " The Three Doctors " ) The Doctor took her on a test flight and landed on Zayin Eight where she got scared at the noises she heard . She saw a ghost of her dead grandfather which lured her off a cliff . She later discovered that Tomis was behind the disappearances . ( AUDIO : " The Mists of Time " ) She was part of Rowe ' s experiments on the Doctor in which he was sacrificed his life for her , but instead she sacrificed her life for his . This happened many times as they were wanting to study why someone would sacrifice their life for someone else . ( AUDIO : " The Many Deaths of Jo Grant " ) The Doctor tried to take her to Metebelis III but overshot and ended up materialising inside the compression field of a miniscope on Inter Minor . ( TV : " Carnival of Monsters " ) By the time of her next meeting with the Master , Jo had learnt to resist his hypnotism . She was continually accused of being a spy for Earth or Draconia . ( TV : " Frontier in Space " ) After this meeting with the Master , the Doctor fell unconscious . He still managed to send a telepathic message to the Time Lords , who piloted the TARDIS to follow the Dalek ship to Spiridon . After being infected by an indigenous plant , Jo helped the Thal s defeat the Dalek army being assembled on Spiridon . ( TV : " Planet of the Daleks " ) Jo was captured during an incident involving giant tortoises and the Master . The Doctor was forced to lower himself down a pit three miles deep and communicate using only his eyes to negotiate for her release . ( AUDIO : " The Last Fairy Tale " ) The Doctor and Jo encountered the Necrobiological s , a race of vampire s , on Sekhmet . The Necrobiologicals escaped aboard a ship called the " Exemplar " and entered a wormhole . The Doctor spent many years searching for the " Exemplar " without success . However , he did not discover the ship ' s fate until his fifth incarnation when the Necrobiologicals attempted to feed on the people of Zaltys . ( AUDIO : " Zaltys " ) Jo went through the TARDIS wardrobe when it landed in the Lezarata Research Centre and couldn ' t find the Doctor in the TARDIS and went to explore . She found the Doctor in a coma and decided to document her discoveries in the lab . She started to hear voices and became freaked out . On discovering the recordings of Benjamin Chikoto , she found out what had happened in the facility . The Second voice trapped Jo on a tape and planned to use her to escape the facility . The Doctor was on that tape and swapped his mind with Jo , in order to trick the voice into leaving Jo ' s body onto a tape , which she then erased . ( AUDIO : " Ghost in the Machine " ) During her travels with the Doctor , she met Harry Houdini at some point prior to the 1920s . She told him about the Bay City Rollers . ( AUDIO : " Smoke and Mirrors " ) The Doctor , Jo and the Brigadier encountered the Mentor , whom the Doctor considered an impostor . ( COMIC : " Death to the Doctor ! " ) Departure . When Third Doctor went to visit Metebelis III without her , Jo went to the Welsh village of Llanfairfach to meet with the activist and mycologist Professor Clifford Jones , whom she much admired from afar . Cliff lived at Wholeweal , an alternative community where he pursued his studies of mushrooms . Jo ' s show of independence made the Doctor behave in a rather childish and hurt manner . In the short time that UNIT were in Llanfairfach , Jo and Cliff fell in love . He reminded her of a younger version of the Doctor . Jo agreed to marry him and resigned from UNIT . The Doctor was devastated by Jo ' s departure , drinking his champagne in one gulp . He left the engagement party on his own after giving Jo a blue crystal from Metebelis III as a wedding present . Before Jo and Cliff left for the Amazon , she asked her uncle to get UN status for Wholeweal ; she told the Doctor it had only been the second time she ' d asked her uncle for anything ( the first was getting her into UNIT ) . ( TV : " The Green Death " ) Later life . A few months later , the couple , who were already on their trip up the Amazon River , returned the crystal by mail because the expedition felt it brought them bad luck ; in her letter with the crystal , Jo wrote that their native guides had said : " Either it goes or " they " go ! " . ( TV : " Planet of the Spiders " ) Jo later tried to call the Doctor at UNIT to keep in touch , but was told that he had left ( presumably after his regeneration into his fourth incarnation ) . Jo waited to see the Doctor again , but he never came . She lived with the Nambikwara tribe in Mato Grosso , Brazil for six months in 1983 . The Doctor was aware of incidents where she lived in huts , climbed trees , tore down barricades , and flew kites on Mount Kilimanjaro among other adventures . While his tenth incarnation was dying he watched her sail down the Yangtze River in a tea chest . ( TV : " Death of the Doctor " ) There were conflicting accounts of the Joneses ' life after their last contact with the Doctor . One depicted Jo as having a daughter named Lisa . ( PROSE : " Once Upon a Time Machine " ) One stated they had a son named Matthew and became estranged by the 1990s . ( PROSE : " Genocide " ) Another presented them as still happily married as of the late 2000s . ( AUDIO : " The Doll of Death " ) A later account showed Jo and Cliff still married , with seven children and twelve grandchildren , and expecting a thirteenth ( who , according to the Eleventh Doctor , would be dyslexic but a great swimmer ) . The Joneses led a life of environmental and political activism , including an incident in which Jo handcuffed herself to Robert Mugabe . ( TV : " Death of the Doctor " ) Reunited with the Doctor . When Jo was told of the Doctor ' s death , she brought her grandson Santiago with her to the funeral at UNIT Base 5 . There , she met and bonded with Sarah Jane Smith , who had been her immediate successor as companion of the Doctor . She seemed sad on learning the Doctor had returned to Sarah Jane , but never her after she had left — being unaware of the Tenth Doctor ' s secret visit shortly before his regeneration into his eleventh incarnation . Both doubted that the Doctor was truly dead . They found that the Doctor had not died , but had been stranded on a deserted planet by the Shansheeth . Although knowing from her past experiences that the Doctor could change his appearance , she was initially taken aback to see how young he now appeared . She learned the Doctor had indeed kept track of her life , even though her constant " on the move " lifestyle had made it difficult for the TARDIS to pinpoint her . He revealed that he visited her and most of his former companions near the end of his tenth incarnation ' s life . Reunited with the Doctor at last , Jo and Sarah Jane stopped the Shansheeth from stealing his TARDIS . Santiago and she set off to Norway by hovercraft . ( TV : " Death of the Doctor " ) Adventures with Iris Wildthyme . At Christmas 2010 , Jo encountered an alien narrator called Huxley from Verbatim Six , who believed that her past adventures had been as the companion of Iris Wildthyme , another renegade Time Lord . To work out the truth , Jo and Iris travelled back to the 1970s . After finding the truth from the Third Doctor , Jo and Iris set off to have adventures of their own . ( AUDIO : " Find and Replace " ) Iris and Jo travelled to Los Angeles in the 1930s . Jo didn ' t like Iris drinking whilst driving . She was delighted to go to a Hollywood party . At this party she met someone she met in her past . She encountered the Eighth Doctor whilst he stopped a monster from attacking the party goers . ( AUDIO : " The Elixir of Doom " ) Working with UNIT again . Kate Stewart came to one of her protests to recruit her for a UNIT mission . Jo was protesting the use of Animal testing in Pharmaceutical trial . She didn ' t realise that Kate was the Brigadier ' s daughter . Kate wanted her to inspect a tidal energy factory , ' Project Charybdis ' . Anthony Burmaster locked them in their quarters whilst he went to locate a Sea Devil Colony . She used her lock picking skills to allow herself and Osgood to escape before the Project exploded . Osgood later helped her to get to the Sea Devil base as she wanted to complete the Doctor ' s work to broker a peace between them . When Krellix told her of his work and that Jastrok wanted the weapons he had created , some Sea Creatures , she persuaded Krelix to get back into hibernation before the base was destroyed . Krelix saved her from drowning . ( AUDIO : " Tidal Wave " ) Kate passed local control of UNIT in the UK to Mike , Benton and Jo due to their experience with Silurian s and Sea Devils before , whilst she couldn ' t get back to base . She thought that the Dinosaurs were beautiful and was annoyed that the Silurians had altered their nature . She wanted to make sure that their was a peaceful negotiations not just war , and stormed off to help Osgood . She learnt how make scientific equipment from the Doctor and learnt of the new technology from Santiago Jones . She decided to take situations into her hands , and went to the Houses of Parliament to negotiate with Jastrok as she thought the Doctor would want her to do . Jastrok to her hostage and gave her to Kalana to ensure UNITs cooperation . She was later released by Benton . Following the defeat she travelled back with Sam Bishop and Osgood to the Sea Devil base to put the Seas Creatures back in hibernation . ( AUDIO : " United " ) Death . According to records in 2040 , Jo died in a house fire in 2028 at the age of 77 . ( PROSE : " Carpenter / Butterfly / Baronet " ) When Newton Calder recalled her " ghost " on Zayin Eight in the distant future , Jo recalled that the last thing she remembered was being at home . ( AUDIO : " The Mists of Time " ) Undated events . At some point , Jo was taken to the Black Archive by UNIT to have her record as a companion of the Doctor taken . ( TV : " The Day of the Doctor " ) Adam Mitchell had in his possession what appeared to be a nude photo of Jo with a Dalek . ( COMIC : " Unnatural Selection " ) Personality . Jo ' s first meeting with the Doctor didn ' t bode well . She mistook an important experiment for an accidental fire and ruined it by dousing it with a fire extinguisher . However , her failures fuelled her enthusiasm . She was determined to prove people wrong about her . When she recovered from ' s hypnosis , she disobeyed orders and followed the Doctor to Luigi Rossini ' s circus . There she proved her competence by rescuing the Doctor . ( TV : " Terror of the Autons " ) Having been hypnotised by the Master once , Jo was able to resist his future attempts at hypnosis by reciting nursery rhymes . ( TV : " Frontier in Space " ) Jo claimed to be a qualified agent , but she may have exaggerated this in the way she exaggerated her A - Levels . She said she took an A - Level in science , but later admitted , " I didn ' t say I passed . " She could ride a motorbike , use karate , pick locks , abseil and even pilot a helicopter — all of which came in very useful as the Doctor ' s assistant . These abilities combined with her enthusiasm made Jo an asset for UNIT . Jo did not initially believe the Doctor when he said he was a time traveller . For much of her time with him , she thought his tinkering with bits of TARDIS was pointless . She was tentative during her first trip away from Earth . She repeatedly begged to be taken home before she realised that the Doctor could not do so . After the Doctor coaxed her , she did step out of the TARDIS and into her first adventure on another world . ( TV : " Colony in Space " ) Captain Mike Yates once referred to Jo as " Jemima Bond , Licence to Spill . " ( AUDIO : " The Doll of Death " ) Whilst Jo was certainly a member of the team , her individualism made her stand out in UNIT and her desire to follow her own instincts and speak her mind made the Doctor and her close . Near the end of her time with UNIT , Jo told the Brigadier that she was going to Llanfairfach even if it meant resigning . ( TV : " The Green Death " ) Although she had been aware of the Doctor ' s ability to regenerate , she was sceptical when she met his eleventh incarnation at the fake funeral the Shansheeth held for him . She accepted his new form after confirming he knew everything that " her " Doctor had told her and knew about her . ( TV : " Death of the Doctor " ) Jo accepted a gun when it was offered to her , even after the Doctor declined it . ( PROSE : " The Eight Doctors " ) Upon joining Iris Wildthyme on her adventures , Jo was happy to be a time traveller once again . She often chided Iris for drinking too much . ( AUDIO : " The Elixir of Doom " )