Fourth Doctor

Lore & Background

After contracting radiation poisoning from Metebelis crystals, the Third Doctor regenerated into this form in 'Planet of the Spiders,' aided by K'Anpo Rimpoche. Unlike his predecessor who worked closely with UNIT, the Fourth Doctor sought to leave Earth for exploration and grew tired of working for the Time Lords, though they continued to send him on missions like preventing the Dalek creation in 'Genesis of the Daleks.' His narrative arc included a trial on Gallifrey where he was framed for assassinating the High Council President; invoking an obscure law, he declared himself a candidate for office to prove his innocence against the withered Master. He later returned to Alzerius in E-Space after being trapped by the White Guardian's Key to Time quest, eventually destroying the last of the giant Vampires before returning to normal space. His tenure concluded on Logopolis when he severed a cable linked to the CVEs to stop Entropy, falling to his death while visions of his enemies and companions played out.

In Their Own Story

The Fourth Doctor's journey began in 'Planet of the Spiders,' where he regenerated after radiation exposure. He quickly departed Earth with Sarah Jane Smith and Surgeon-Lieutenant Harry Sullivan, though Harry later chose a train over the TARDIS on Zeta Minor, leaving the pair to travel alone until they reached Gallifrey. There, the Doctor faced a trap set by the skeletal Master and was framed for murder, forcing him to run for High Council President. Following this, he visited a planet where his past imprint on the computer Xoanon had created a warrior tribe, the Sevateem; after curing the computer, Leela joined him. They acquired K-9 in 'The Invisible Enemy' before facing the Fendahl and later returning to Gallifrey to become Lord President, a move that inadvertently exposed the planet to Sontaran attack. The quest for the Key to Time brought Romana (Mary Tamm) as a companion; after she regenerated into Lalla Ward's form, they used a Randomiser that ironically sent them to Skaro. In E-Space, Adric joined them, and after escaping via a white void where Romana stayed behind with K-9, the Doctor returned to Traken. There, he met Nyssa and confronted the Master, who possessed Tremas' body. Finally, on Logopolis, Tegan Jovanka appeared as the universe faced entropy; the Doctor sacrificed himself by severing a cable under a rotating radio dish, uttering his last words: 'It's the end — but the moment has been prepared for...' before merging with the Watcher to regenerate.

Reader's Guide

The Fourth Doctor is characterized by his capacity for righteous anger and whimsical warmth. His companions include Sarah Jane Smith, Harry Sullivan, Leela, K-9 (both Mark I and II), Romana I and II, Adric, Nyssa, and Tegan Jovanka. Key plot points involve his refusal to bow to the Time Lords' authority, his manipulation of the High Council election in 'The Deadly Assassin,' and his destruction of giant Vampires in E-Space. The era concludes with a dramatic regeneration on Logopolis caused by the Master's sabotage of the Pharos Project radio telescope. Fans should note that Baker's seven-season run remains the longest for any lead actor, establishing this version as a definitive icon of 1970s British culture.

Did You Know?

• Tom Baker's seven consecutive seasons remain the longest tenure of any actor to portray the lead in the series' history.
• The Fourth Doctor was framed for the assassination of the President of the High Council and declared himself a candidate for the office to avoid execution.
• He accidentally imprinted his own mind on the computer Xoanon centuries before returning, creating a warrior tribe called the Sevateem who viewed him as an evil god.
• The Master, having degenerated into a withered skeletal husk after using all regenerations, was responsible for framing the Doctor on Gallifrey.
• His final words before regenerating were: 'It's the end — but the moment has been prepared for...'