Watch The Flash Season 4 Episode 20 Full HD Online with SUB

DeVoe begins collecting the technology needed to create the Enlightenment Machine, killing anyone who gets in his way. Barry, Cisco, Iris, and Harry try to summon the powers of Frost's Killer into Caitlin, but to no avail. Harry tells the team that the amount of dark matter he used with the Thinking Cap caused brain damage. Cisco, Gypsy, Barry, and Caitlin battle Marlise and Devo as they attempt to acquire the computers needed to power the Enlightenment Machine. The flashback partially reveals why Marlise follows DeVoe: she was a humanitarian worker in Kenya who created a water purifier for a villager, but when the warlords found out about it, they attacked and killed everyone. Marlise pleads with Devoe when he begins to strangle Gypsy; she later decides to leave him, encasing his chair in a force field so that DeVoe cannot prevent her from leaving the pocket dimension. The team realizes that Devo plans to use the Enlightenment Machine to launch dark matter to Earth, returning all of humanity to a simplified state similar to what Harry has become. A mysterious girl brings a gift to Cecile and Joe in the baby shower and, quickly leaving, escapes using the speedster's abilities.