Abigail Pettigrew

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

Frozen
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.

Christmas adventures
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. Over the years as he grew older, she and Kazran fell in love, but 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, using the shark to fly across the sky in a carriage like they did in one of their first adventures with the Doctor. (DW: A Christmas Carol)