Samantha Mulder was the sister of Fox Mulder, and daughter of Bill and Teena Mulder. She was abducted at the age of eight as part of a deal by the Syndicate to ensure an alliance with the Colonists. Samantha was the subject of 'tests' at the hands of alien collaborators and lived for a time with Cigarette-Smoking Man and a young Jeffrey Spender at a military base. She was 'taken' by walk-ins after escaping her masters. Her disappearance inspired Mulder's quest for the truth.
- Season 10