Sarah Jefferson is a character in the novels Jason X: Planet of the Beast and Jason X: Death Moon. A twenty-eight year-old geneticist from the province New Saskatchewan on Earth II, London is named after the city of same name and is unofficial second-in-command of G7, a space station orbiting and studying Planet#666 (nicknamed "The Planet of the Beast"). When the head of G7, due to an experiment conducted by Professor Claude Bardox she was impregnated with the genetic material of Jason Voorhees, causing her to give birth to their son Free Jefferson.