Abigail Pettigrew

Abigail Pettigrew was one of the people taken by Elliot Sardick as "security".

Biography
Abigail was taken by Elliot Sardick and cryogenically frozen. This allowed him to barter with those who owed him money, in this case, her family. She was suffering from a fatal disease, the freezing prevented her death but when she awoke the process continued.

Abigail befriended Kazran Sardick when he was young. She was able to calm a shark with her singing. Kazran and the Doctor woke her every Christmas eve and took her to various locations. Kazran stopped waking her when she told him she had one day left to live unfrozen. He woke Abigail when she was needed to soften the cloud shell of the planet. Kazran and Abigail then spent her last day together. (DW: A Christmas Carol)