Outlander fans will be very familiar with antagonist Geillis Duncan, who served as the primary villain for the third season of the series. However, many may be unaware that she was inspired by a real individual.
In Outlander, Geillis is a time-traveller who kills her husband in the 20th century in order to travel back to the 1700s in an effort to change the course of Scotland's history. She meets protagonist and fellow time-traveller Claire Fraser in the first season, where the two bond over their shared interest in herbs.
It is not until the season's 11th episode, when they are both on trial for being witches, that Claire discovers Geillis' true identity after seeing her smallpox vaccination scar. She saves Claire's life and is sentenced to death - though is eventually able to escape.
