The Flash 6×14 “Death of the Speed Force” Sneak Peek with guest star Keiynan Lonsdale – WALLY WEST SPEEDS BACK INTO CENTRAL CITY – Kid Flash (guest star Keiynan Lonsdale) returns to Central City with a Zen attitude and new tricks up his sleeve. While thrilled to see his family again, Wally confides to Barry (Grant Gustin) that he returned because he thinks there is something wrong with the speed force. Meanwhile, Cisco (Carlos Valdes) returns from his fact-finding mission across Earth-Prime. Brent Crowell directed the episode written by Sam Chalsen & Emily Palizzi Gilbert (#614). Original airdate 3/10/2020.