The 3rd Doctor. The dandy, Scientific Advisor, Exiled and Mr. Venusian Aikido. His arrival comes right off the heals of being sentenced to exile by the Time Lords. Once he clapsed from outside the TARDIS, the face we see is not of the flute playing cosmic hobo, but that of a tall, aristrocratic, gentleman. He was found and taken to hospital by soldiers of the United Nations Intelligence Taskforce (UNIT) upon the orders of Brigadier Lethbridge Stewart. Around the same time, mysterious spores began to turn up on earth from the disembowled creature known as the Nestine consciousness. It along with their aid sought to take over the planet. Fully recovered (and with stolen clothes), the Doctor assisted UNIT and Cambridge scientist Elizabeth Shaw in putting a stop to the Nestine and their Autons. Exiled and with the TARDIS inactive, the Doctor had to make due with his new surroundings and his newfound role as UNIT's Scientific Advisor.
Throughout the first of his three Earth years in exile, the Doctor, Liz and the UNIT crew (plus their new newly promoted Capt. Mike Yates) found themselves thwarting alien incursions: Cave monsters who were the original inhabitants of Earth, the Mim, Mars Probe 7's missing astronauts, WOTAN's remains (with help from Liz's mother), Cybermen, and the Devil Goblins of Neptune. At one point, while repairing the TARDIS, the Doctor found himself traveling into a parallel version of Earth and his familars where the world near nuclear destruction. By year's end and one violent end after another, it all proved to be too much for Liz as she left UNIT. However, she would see the Doctor again a year later only to end up dealing with New Dawn and their sentinals. After Liz's departure, the Doctor would be assigned a new young assistant in Josephine Grant. At first he didn't warm to her but did eventually. At this time, another time capsule entered the planet in the form of a trailers and in it was another exile, a deadly Time Lord who called himself The Master...
During the third and final year in exile, the Doctor and the UNIT crew found themselves dealing with the Daleks, their ape-like associates the Ogrons, and a hostile guerrilla group from an sent to assassinate Sir Reginald Styles in order to prevent their dark future from coming to fruition. The Time Lords would have the Doctor perform two more missions despite his earlier assumption that the TARDIS was fixed. The first involved Peladon and its entry into the Galactic Federation with the dandy gent mistaken for a human dignitary. The other mission saw the Doctor delivering an unknown object to the planet Solos where humans transformed into mutants. Sometime later on Earth, the Doctor found himself dealing with the Master once again while ecounter another race of Earth reptilia, the amphibious Sea Devils. It was this event that let to his old foe escaping prison. Following from the encounter, the two crossed paths again when the Master aided a mind parasite that fed off the energy of its host. In the midst of it all, the Doctor fell to his death triggering a premature regeneration which proved difficult for the creature leading to it's demise and the regeneration undone. It was the first time Jo saw a future incarnation of the Doctor; one who she described as "teeth & curls"...
Another Master encounter involved the device known as TOMTIT used to revive the Chronovore called Kronos leading the Doctor and Jo to travel to Atlantis to prevent the second attempt. The Atlanteans managed to summon Kronos triggering
Atlantis' destruction; the Doctor, Jo and the Master escaped unharmed. Sometime later, the Doctor and Jo encounter the self-professed Time Lady/Clockwork Iris Wildthyme and
her companion Tom while dealing with robotic sheep and an alien creature dubbed Vertigris. A later encounter with Iris saw the Doctor acquiring the aid of a novelizer from Verbatim Six known as Huxley in erasing both her and Jo (circa Christmas 2009) memories of him. The two women were very upset with the Doctor upon him telling the truth; future Jo even more outraged as she never want her memories of her time with him undone and retconned. Before taking off with Iris, the Doctor assured future Jo that he'll one day see her again once free from exile; She eventually did see him again; this time in his eleventh incarnation. By year's end, the Doctor would be lifted from exile for good when the Time Lords enlisted his first and second incarnation in stopping an unusual energy blog from a universe of anti-matter sent by the deranged Omega, co-founder of Time Lord society.
Free from exile, the Doctor took to the stars once again in his TARDIS with Jo by his side. Upon their first trip, they took Liz Shaw (in her first time ever inside the ship) with them to December 1916 where they met Gregori Rasputin. One travel led to the Doctor returning to Earth where he'd find a spaceship hovering over UNIT HQ and a suspicous individual casting alternate scenarios; particularly Jo dying over four hundred and twelve times. Following on was fiendish alien puppet show known as the Scorchies. Having came to him as an idea, the Doctor sought out to take Jo to Metebelis 3. There were several attempts to get there, however: the two travelers found themselve inside a miniscope originally obtained by a showman and his assistant. Plus, tackling extreme temporal anomalies on the planet Caresh. Whilst, the in the middle of growing political tension between Earth and Draconia, the Master provoked both parties into war under Dalek orders. The event ended with the barely conscious Doctor helped back to the TARDIS by Jo before sending a message to the Time Lords to follow the Daleks to their new base on Spiridon.
On several occassion Capt. Mike Yates joined in on the travels including to the planet Nooma. However, he would forget that he ever stepped into the TARDIS four decades later when the Hornet Queen possessed him during his stay in Hexford. After several attempts, the Doctor finally managed to go to Metebelis 3 where he took a blue crystal. Upon returning to Earth, he joined Jo and UNIT in the investigation of a dead minor who's skin was green. It was revealed that the computer BOSS was responsible for the polution triggering the effects and giant maggots. With the use of the blue crystal, the Doctor broke BOSS' influence on the Global Chemical staff and was the computer was destroyed. During this event, Jo met and fell in love with the scientist Cliff Jones; they later announced they were getting married and going to the amazon in search of rar fungus. The Doctor offered his blessing and as a gift, he gave Jo the blue crystal. He left the celebration discreetly in sadness.
Several adventures later, the Doctor (with UNIT and ex-Capt. Yates) looked into some mysterious events at a meditation retreat ran by Tibetan monks; they were linked to the very planet he once obtained the blue crystal. In order to stop the spiders from destroying the cosmos, the Doctor sacrificed himself to the Great One; the spiders' leader while exposed to radiation in the process. Upon the defeat of the Great One, the Doctor wandered in the time vortex for nearly a decade (for Sarah Jane, five weeks) with the radiation slowly killing him. Once landing back in UNIT HQ, the Doctor calapsed out of the ship and died in front of Sarah Jane and the Brigadier. Arriving just in time, his former mentor K'anpo Rimpoche helped him to regenerate into his fourth incarnation; the very image Jo saw briefly: teeth & curls.