The Flash 2x19 promo The Flash Season 2 Episode 19 Promo 2x20 S02E19 Preview A meta-human with super strength named Griffin Grey (guest star Haig Sutherland) mistakes Harry (Tom Cavanagh) for Earth-1 Harrison Wells and kidnaps him, demanding that Wells cure him from his current condition. Realizing another brilliant Wells could help track Griffin’s location, Barry asks Jesse (guest star Violett Beane) to help. Meanwhile, Wally (Keiynan Lonsdale) corners Joe (Jesse L. Martin) about The Flash. John Showalter directed the episode written by Brooke Roberts & Katherine Walczak (#219). Original airdate 4/26/2016. Subscribe to AresPromo on Youtube for more The Flash season 2 promos in HD. The Flash 2x19 Promo/Preview. The Flash Season 2 Episode 19 Promo. The Flash 2x20 Promo Season 2 Episode 20 Promo will be uploaded next week!.