Sherloque uses a memory machine to try and revive Grace, and Nora ends up trapped in the girl's memories. Barry and Iris go in to save their daughter, and see her memories of a future Iris. Meanwhile, Ralph tricks Cisco into a night out.

With Barry out of contact in the Speed Force, XS witnesses Cicada kill Killer Frost and tries to travel back in time to stop the outcome... and a different teammate dies with her every attempt.