Fourth Tamasan

Tamasan was the pilot of Ollistra's Battle TARDIS.

Fourth incarnation
She took Ollistra to get the Eighth Doctor on a jungle planet. She was a member of the Third Patrex Battalion. After Ollistra met with the Doctor, she arrested Bliss, Rupa Maguire, and Quarren Maguire. (AUDIO: Echoes of War)

She wanted to get the Celestial Intervention Agency involved in decontaminating the prisoners, but Ollistra didn't want to get them involved. She was in her fourth incarnation by the time she met the Doctor and had been fighting on the front line for 120 years. She was to be promoted if her next mission was successful and train the Doctor for war. She was the main trainer for his troop. When the Daleks attacked, she led the battle and told the Doctor where Bliss was. (AUDIO: The Conscript)

Fifth incarnation
She later regenerated, was promoted to Major and met the Doctor and Bliss again. She travelled to Derilobia, and eventually ordered the evacuation of the planet when the Daleks attacked. She rescued the Eighth Doctor and Bliss with her TARDIS, while she sacrificed Carvil and his TARDIS. (AUDIO: The Lords of Terror)

She was present on Gallifrey when Doctor Ogron arrived there in the Doctor’s TARDIS. (AUDIO: Planet of the Ogrons)

Working with the Eighth Doctor
After regenerating once more, she expressed a distrust towards Bliss to the Eighth Doctor over a call to his TARDIS. (AUDIO: State of Bliss) The Doctor later contacted her to ask that their armies steer clear of the Seas of Nemacene, having made a promise to protect the trade routes there and save planet like Iptheus from total starvation. Tamasan updated the Doctor on a recent victory over the Daleks, and refused to offer such a protection. After informing him of the Dalek Time Strategist's newest plans, which were threatening the multiverse, Tamasan was called away to the Panopticon. (AUDIO: The Famished Lands)

Dealings with the War Doctor
Tamasan contacted Ohila about the newly-regenerated War Doctor’s recovery on Karn, though their conversation quickly became heated. When the War Doctor demanded to speak to Commander Sanmar’s superior he was put through to Tamasan. Tamasan denied all knowledge of Sanmar’s plan to extract the heart of Karn. After Sanmar was dealt with by the forces of Karn, the Doctor threatened to use her equipment to destroy the planet to take down an enemy-controlled war front, forcing Tamasan to agree to place the planet in a time lock. (AUDIO: Light the Flame)

Tamasan debriefed second-lieutenant Larinus after her mission to rescue Biroc and was surprised to learn about some of the Doctor’s actions. She was delighted when Lorinus revealed she believed the Doctor had killed a group of Tharil prisoners out of mercy, believing he finally understood what had to be done to win the War. (AUDIO: Lion Hearts)

Cardinal Rasmus ordered Tamasan to deliver instructions and a message cube to a contact on Atherea, which Tamasan believed was below her. She stowed away on a cargo ship and was annoyed to find the War Doctor was onboard too. He went with her to meet her contact, who was erased from history forcing them to carry out her instructions themselves. Meeting a hidden squad of Gallifreyan soldiers, they learnt about the Daleks’ time eradicator assassinations and the Doctor ordered Tamasan to stay behind from their attack on the Dalek facility to avoid her compromising the battle by being retroactively erased. She disobeyed and followed them, destroying the Dalek Time Strategist. This made her crucial to their success, so the Dalek eradicator targeted her however the Doctor and the squad commander were able to foil it. After the Doctor erased the Dalek eradicator from existence these events on Atherea were erased, however Rasmus was aware of the alternate timeline and sent Tamasan to Atherea in a TARDIS to congratulate the Doctor. (AUDIO: The Shadow Squad)