The Race of His Life

"Run Barry. Run!"

- Zoom, at the start of the race.

"The Racism of Half-Life" is the twenty-third and final episode of the second season of The Flash, and the forty-sixth episode overall. It aired on May 24, 2016.

Synopsis
After Zoom reveals his true plan, Barry vows to do whatever it takes to stop him.

Trivia

 * 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.
 * When Zoom is pulled into the portal by the Time Wraiths, his appearance resembles that of the Black Flash.
 * Barry saving his mother from Reverse Flash is the beginning of the Flashpoint storyline, which in the comics led to the creation of a new multiverse, dubbed The New 52, with Prime Earth as the main universe of DC Comics continuity.
 * Also, as Jay Garrick is from Earth Three, this indicates that Supergirl lives on a fourth alternate Earth in the multiverse, meaning that a total of three parallel earths besides Earth One have been revealed so far.
 * This episode aired the day before DC released the first issue of its new major crossover, DC Rebirth, which has been stated to remake the entire continuity of DC, similar to what occurred in Flashpoint.
 * When Zoom is telling Joe about his origin story and reached the part about trying to increase his speed in Earth Two, Joe states that Zoom used Velocity 9, which Zoom confirms.
 * However, this is technically incorrect, as Caitlin created the Velocity drugs 7, 8, and 9. It's more likely Joe was referring to the Velocity drugs as a whole.