Geillis Duncan is one of the main antagonists of the Outlander franchise. She is a supporting character in Season 1 and the 1991 novel Outlander, a mentioned only character in Season 2 and Dragonfly in Amber, and the main antagonist of Voyager and Season 3. She was once friends with Claire and was a time-traveller but soon becomes her mortal enemy. Geillis travels back in time to help with the Jacobite uprising and Gain Scotland's independent freedom from the country of England and restore Prince Charles back on the throne. During the 1760s, Geillis nearly sacrificed a young Ian Murray to travel to the 1960s and kill Brianna, who believed she needed to die so a Scottish King would be on the throne again. However, she was accidentally and ultimately beheaded by Claire after Geillis' crimes against her husband Jamie and their nephew, Young Ian.
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