Doc Brown from the Back to The Future trilogy has got to be one of the all time most memorable time travelers. He and Marty McFly usually save the day, but what if Doc had been the protagonist in other time travel movies? Great Scott!
With Added Doc Brown: The Doc appears in place of Michael Biehn’s resistance fighter, repeatedly turning up in the nick of time to spirit Sarah off to safety. This is one occasion in which he’s happy to meddle with the timeline!
Risk To The Space/Time Continuum: Despite keeping Sarah safe, the Doc lacks Biehn’s general hunkiness, meaning Connor remains unwooed, and young John is never born. Thus, humanity is screwed anyway.