The Entire History of You was an episode .
The episode , set in an alternative reality where most people have `` grains `` recording everything they do , see , or hear , and allowing them to play back their memories in front of their eyes or on a screen , tells the story of Liam -LRB- Toby Kebbell -RRB- , a man who starts suspecting that his wife Ffion -LRB- Jodie Whittaker -RRB- might have an affair .
The Entire History of You