DOCTOR WHO IN DETAIL

Bill Potts worked as a cafeteria worker the university where the Twelfth Doctor was teaching, and often sneaked into the Doctor's lectures. The Doctor notices that although she is is not a student she is genuinely interested and offers to tutor her privately. After meeting a girl - Heather - who disappears Bill joins the Doctor and Nardole.

After being left alone on a Mondassian space craft, and converted into a Cyberman, Bill was saved by Heather, now an oil being, after being changed into another oil being.

In the Twelfth Doctor's final outing a glass creature is created using Bill Potts' memories.

First regular appearance: The Pilot

Final regular appearance: The Doctor Falls