Tania Bell

Tania Bell was a companion of the Eighth Doctor, member of Torchwood Three and a resident of 107 Baker Street in 2020.

Early life
Tania was transgender, a fact that some people did not like. (AUDIO: Wild Animals) As a child, her father often told her to leave the house for upsetting her mother.

By 2014, Tania moved into Flat 1 at 107 Baker Street. (AUDIO: Lost Property) Her mission, given to her by the Torchwood Institute, was to keep an eye out for the Doctor, who was known to visit the address from time to time. She was in contact with Sergeant Andy Davidson and, unbeknownst to her, had her flat bugged with cameras. (AUDIO: Must-See TV)

The Doctor's arrival
In 2020, Tania finally met the Doctor in his eighth incarnation when he moved in with Helen Sinclair and Liv Chenka, to whom she was attracted. (AUDIO: Lost Property) She was aware that it was too early in his timeline for him to know about Torchwood and, thus, had to keep him from finding out about her affiliation. (AUDIO: Must-See TV)

Tania suggested that something might be exacerbating tensions in the house when arguments and paranoia abounded. Once the Doctor had put a stop to it, she made a telephone call and told Torchwood that the Level 2 activity had been resolved with no further action being necessary. (AUDIO: Lost Property)

Although Liv refused due to a prior experience, Tania offered both Liv and Helen smart phones. Helen asked her to visit Liv in the hospital after she was shot and fell unconscious. Tania asked Liv out for dinner after she woke up and told her that she was transgender, which Liv was unfazed by. (AUDIO: Wild Animals)

Andy visited the house after Tania went somewhat quiet, annoying Tania as the appearance of a police officer made Liv suspicious. She was further irritated to find that Torchwood had bugged her flat and smuggled Andy in to point them out so that she could remove them. She and Liv later agreed to a "no questions, no lies" policy with regards to their secrets. (AUDIO: Must-See TV)

As Torchwood needed the Doctor to not be a "broken man", Tania directed him towards Mr Crusoe, which angered Andy. Her date with Liv was hijacked by the Doctor and attacked by Teeja and Burakai, whom Tania helped chase. Following their defeat, Liv took Tania and Robin Bright-Thompson to a pub to tell them who she really was. (AUDIO: Divine Intervention)

After the pub, the Doctor invited Tania to join him, Liv and Helen on a test flight in the TARDIS. They were joined by Andy and ended up 6 million years in Earth’s future. The Doctor and Tania explored the ruins of London together, with him telling her about regeneration. Liv and Andy led a decontamination sentinel to them, which the Doctor told them to disable with rocks. Realising an army of the robots was approaching, he gave Tania a TARDIS key and told her, Andy and Helen to return to the TARDIS. The ship refused to let them in, so Andy took the opportunity of them being trapped to confess that Torchwood had actually been shut down. When the Doctor, Liv and Robin returned the TARDIS yielded and the Doctor took them back to 2020. (AUDIO: Dead Time)

Tania insisted on joining the Doctor in going back in time to 1941 to investigate an unexploded bomb which had just been unearthed in 2020. Liv followed her to the bomb site, discovering an alien stasis pod, and together they stopped the stasis spreading beyond the site. Emerging after days in and out of stasis, they reunited with the others and returned to 2020. (AUDIO: Baker Street Irregulars)

Tania travelled with the Doctor to 2050 to investigate the altered future, along with Liv, Helen and Andy. They were all immediately captured by forces opposing Divine Intervention and Tania was subsequently interrogated by Gemma Houlbrooke. The Doctor eventually convinced Gemma to release them and they returned to 2020. (AUDIO: The Long Way Round)

Personality
Tania described herself as nosy (AUDIO: Lost Property) and told the Doctor that she enjoyed shopping whenever she was upset. (AUDIO: Divine Intervention)

Behind the scenes
Tania is the first transgender companion in any Doctor Who media.