Free Jefferson is a character from the novel Jason X: To The Third Power. He is also the son of Jason Voorhees and Sarah Jefferson. While at first unaware of his parentage (his mother having kept it secret from him) Free discovers he is Jason's son and the result of a genetic experiment conducted by Professor Claude Bardox while working on one of Earth II's moons, where Jason himself is being held, unknown to everyone except the AI running the facility. In the end Free, when Jason escapes containment, manages to survive by launching his "father" into space, onto Earth II's second, uninhabitable moon. Left alone on the moon (everyone else having been slaughtered by Jason or each other) Free has only the AI for company as he awaits a rescue that may not come.
- Due to his father's abilities and half of Free's DNA is from him he may have gotten some powers from his father Jason. However, this may or may not be true, as Jason's powers are the result of supernatural forces, not genetics.
- Free appeared on an episode of Family Guy. However, his name was Justin Voorhees instead of Free Jefferson.