The Flash 8x20 "Negative, Part Two" Season 8 Episode 20 Promo (Season Finale) - SEASON FINALE - With The Flash (Grant Gustin) still reeling from everything that just happened, the rest of the team rallies to support him when he needs it the most. The series also stars Jesse L. Martin, Candice Patton, Danielle Panabaker, Danielle Nicolet, Kayla Compton and Brandon McKnight Marcus Stokes directed the episode written by Eric Wallace (820). Original airdate 6/29/2022.