and they're androids in the stylee of Westworld.
Escaped from secret research facilities run by a shaodowy organisation, their neural chips filled with the skills and memories of their historic selves, they travel the earth trying to uncover and expose the truth about the organisation. How do they blend in with us humans? Do they learn how to do it better? Can they get hardware upgrades to better their chances of success? Are there underground movements in cahoots and in oposition to the organisation? Governments? Aliens? What was the point of these historic androids in the first place? A cover for the research or something more sinister?