: Zoom brings an army of Earth-2 meta-humans to Earth-1 to take over Central City [11]. Iris West coins the term "Metapocalypse" in her newspaper reporting to describe the siege [4, 11].
The episode concludes with a major turning point leading into the season finale: [S2E22] Invincible
: Wally begins acting as a vigilante, attempting to help the Flash stop the meta-human "army" despite not yet having powers [1, 21]. He also discovers Barry's secret identity when he sees Barry speed off after Zoom [8, 17]. Significant Plot Developments : Zoom brings an army of Earth-2 meta-humans
: Katie Cassidy appears as Black Siren, the Earth-2 doppelgänger of Laurel Lance (Black Canary) [2, 15]. She leads Zoom's army and is eventually defeated by a vibrational frequency device that neutralizes Earth-2 inhabitants [2, 9]. He also discovers Barry's secret identity when he
: Cisco experiences disturbing visions of Earth-2 being destroyed, signaling Zoom’s ultimate plan [8, 25].