Wallace Fitch

Wallace Fitch was a brief companion of the Tenth Doctor.

Biography
Wallace Fitch was the assistant of Mr Pemberton. Unknown to Wallace at the time, Mr Pemberton was under the influence of the Rutans. He was taken to Chelsea 426 gardens and was sprayed by Professor Wilberforce's perfume. This made him also fall under control of the Rutans. His next task was to get to the Doctor who was archenemy of the Rutans. He managed to give tickets to the Carstairs family. The only member of the family who did not go to the garden event was the Carstairs' father. Instead it was the Doctor who got to go, and while the gifting of the tickets was part of a trap to infect any guests to the show with the Rutan virus, the only person who got infected was Bess Carstairs.

Wallace then chased the Doctor and the twins onto the TARDIS where they were hiding along with a man known as the Major. A struggle ensued in which the Major was killed by the infected Wallace, but when the Doctor returned to the TARDIS he released excess amounts of oxygen through his ship which freed Wallace from the Rutan Virus. The newly cured Wallace then assisted the Doctor and the Carstairs twins in defeating the Sontarans and the Rutans, and saving Chelsea 426. With the crisis averted and the Doctor heading off to a new adventure, a romance began to blossom between Wallace and Vienna Carstairs. (NSA: The Taking of Chelsea 426)