Directed by John Polson and written by Timothy J. Lea and Scott M. Gimple, the episode received positive reviews.
Olivia (Sonya Walger) and Charlie (Lennon Wynn) are at the beach, deciding to avoid whatever future was in store for them; Lloyd (Jack Davenport) meets her there and urges her to return home.
She agrees, and Lloyd and Olivia are surprised when Dylan (Ryan Wynott) writes the equation in lipstick on the mirror.
Demetri (John Cho), Janis (Christine Woods), and Simon (Dominic Monaghan) head to NLAP to try to stop the next blackout from occurring, as well as discover who is behind it all.
Janis creates a diversion for security, allowing Demetri and Simon to enter NLAP undetected.
Bryce (Zachary Knighton) finds Keiko (Yūko Takeuchi) has already left when he arrives at the detention center, and he heads to the sushi restaurant to wait for her.
Stan (Courtney B. Vance) has Mark (Joseph Fiennes) released from jail and has him talk to Aaron on the phone to calm him down.
After being led outside in custody, Hellinger (Neil Jackson) nods to some men in bomb squad gear who are working for him.
Lloyd contacts Mark, telling him the equation yielded an interval indicating that the next blackout will occur within the next two days.
Mark notices Gabriel’s (James Callis) drawing of his mosaic board and changes his own to match it.
Club gave the finale a B− with mixed reviews, calling it "irresistible," but also said "wouldn't miss the show.