Mr Barnabas

Mr Barnabas was the name of Sarah Miller's teddy bear. She held onto it when she was buried during an air raid. Both she and the bear were rescued. (PROSE: Tell Me You Love Me)

Behind the scenes
In 2022, Scott Matthewman expressed on Twitter how it was "slightly mad" that there was a Tardis Wiki page dedicated to the bear, and that, jokingly, that he hoped Mr Barnabas would cameo in the sixtieth anniversary specials.