London Jefferson is a character in the novels Jason X: Planet of the Beast, Jason X: Death Moon and, posthumously, Jason X: To the Third Power.
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 Prof. Claude Bardox she was impregnated with the genetic material of Jason Voorhees, causing her to give birth to their son Free Jefferson.