- "Run Barry. Run!"
- —Zoom, at the start of the race.
Having just witnessed Hunter kill Barry's father in front of him, Barry is sent into a blind rage. Barry chases after Zoom, now faster than him, and is able to beat him up. However Zoom manages to create a time remnant, which is what Barry ends up catching instead. While Barry is moments away from killing Zoom's time remnant, the real Zoom appears and kills the remnant himself.
After Henry's funeral, Hunter challenges Barry to a race to determine who is faster, threatening to kill everyone Barry loves if he refuses. Harrison discovers Hunter is in possession of a magnatar, a device that will destroy every planet in the Multiverse except Earth One which requires both their speeds to power. When Barry refuses to back out, the team locks him in the pipeline and forces Hunter back to Earth Two themselves; but Hunter abducts Joe in the process. Wally discovers this and frees Barry, who agrees to Hunter's race. As Barry and Hunter race around the magnatar, the former creates a time remnant to free Joe and destroy the machine but at the cost of dying while the prime Barry defeats Hunter, who is then taken away by Time Wraiths for his crimes against the timeline. Barry rescues the man in the iron mask, who is revealed to be the real Jay Garrick, Henry's Earth Three doppelganger. Harrison, Jesse and Jay return to Earth Two, from where Jay plans to return to Earth Three. Barry, still feeling broken and defeated, travels back in time and stops Eobard Thawne from killing Nora.
- Cisco refers to his Vibes of Earth Two being destroyed as like "watching Transformers in 4D", but more realistic and with better acting.
- Discussing Zoom's plan, Cisco states "one pulse to destroy them all", likely a reference to the infamous phrase "One ring to rule them all" from J.R.R. Tolkien's The Lord of the Rings.
- Hunter Zolomon comments on how he'll have "a Flash from two worlds" to keep him company. This is a reference to "The Flash of Two Worlds" story, which featured the Barry Allen and Jay Garrick Flashes crossing over for the first time.
- Cisco mentions that Harry will do his "best Frankenstein", referring to the titular scientist of Mary Shelley's 1818 novel, Frankenstein.
- The way Barry's time remnant dies is similar to how Barry died during the Crisis on Infinite Earths event, running so fast he disintegrates while saving the multiverse from destruction by the Anti-Monitor.
- When Zoom is pulled into the portal by the Time Wraiths, his appearance resembles that of the pre-New 52 Black Flash.
- This episode picks up immediately where the events of the previous episode left off.
|The Flash season 2|
|"The Man Who Saved Central City" • "Flash of Two Worlds" • "Family of Rogues" • "The Fury of Firestorm" • "The Darkness and the Light" • "Enter Zoom" • "Gorilla Warfare" • "Legends of Today" • "Running to Stand Still" • "Potential Energy" • "The Reverse-Flash Returns" • "Fast Lane" • "Welcome to Earth-2" • "Escape from Earth-2" • "King Shark" • "Trajectory" • "Flash Back" • "Versus Zoom" • "Back to Normal" • "Rupture" • "The Runaway Dinosaur" • "Invincible" • "The Race of His Life"|