Season 3 Episode 10: Zoey

"The world has suddenly learned the truth: time-travel exists, and the QIA has been using it for over a decade. While the people at the London Hub deal with the massive fallout, including the arrival of an unwelcome new member of the Field Team, an old enemy of the agency, thought long-dead, has resurfaced. Meanwhile, just as Agent Sarah Cunnington was finally putting her life back together, a deadly encounter with her own future self has knocked her back again – and possibly on course to becoming that murderous psychopath they now know is calling herself Fran Grenouille…"