: 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].
: Following his recent experience in the Speed Force, Barry exhibits a "zen-like" and potentially dangerous level of confidence, believing the universe is on his side [6, 10, 21]. [S2E22] Invincible
: In a move designed to prove that he and Barry are the same, Zoom kidnaps Barry's father, Henry, and kills him in Barry’s childhood home—the same location where Barry’s mother was murdered [14, 16, 25]. : Katie Cassidy appears as Black Siren, the
: 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 : In a move designed to prove that
: 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].