Martin Donaldson

 was the brother of Kitty Donaldson. He lost his leg in World War I. Kitty asked the Eighth Doctor to look at him. The Doctor asked him to accompany Liv Chenka around town. The Doctor detected an unstable time field around him and his room. He took Liv to watch a Buster Keaton film. He took his mother's wedding ring but lost it at the cinema. He also took her to the British Museum. The Doctor worked out that he was stuck in a time loop. He fell in love with Liv. (AUDIO: A Life in the Day)