Enter Zoom

"Enter Zoom" is the sixth episode of the second season of The Flash and the twenty-ninth episode overall. It aired on November 10, 2015. It is the second half of a two-parter.

Synopsis
After recent events, Barry decides it's time to confront Zoom and comes up with a dangerous plan. Caitlin sides with Jay and deems it too dangerous for Barry to engage with the speed demon. However, Iris shows her support and brings forth a surprising ally. We see what Earth-2 Harrison Wells' life was like before coming through the breach.

Trivia

 * After Barry wakes up, Cisco informs him that Linda is staying in Coast City; in the comics, Coast City is the home place of Hal Jordan, the Silver Age Green Lantern
 * The Earth-2 equivalents of Oliver Queen and Robert Queen are reversed: Oliver Queen is revealed to have died in the Queen's Gambit shipwreck while Robert Queen survives and becomes The Hood, later The Arrow. This is reminiscent of the "Flashpoint" arc, in which Thomas Wayne became Batman and Bruce was killed instead.