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Polly Evans was a student at Snowcap University. In 2048, she had joined the classified Project Sub-Zero, where she was incommunicado to the outside world and had been genetically engineered by Dr Patricia Audley's experiments to survive in the extreme cold. She was turned into a penguin-like hybrid. As a result, she failed to return home at the end of term, which concerned her father, George.

Polly Evans After Audley's Experiments (Blood and Ice)

Polly after Patricia Audley's experiments

Clara Oswald later confronted Polly and informed her that her father was dead. Polly and the other test subjects were later released from their cell by Winnie Clarence and the Twelfth Doctor. (COMIC: Blood and Ice)