Rona Bellows

Professor Fiona Bellows was one of the people attacked by dream crabs. She was able to wake up from the crab-induced dream, killing the alien creature in the process, with the help of the Twelfth Doctor and Santa Claus. (TV: Last Christmas)

Just like Ashley, Albert and Shona, she was under the belief that she was a scientist working at the North Pole. When she regained consciousness, it is revealed that she is a grandmother and a wheelchair-user.