Flash and Legends Trailers: Grodd attacks Central City, Rip takes the Waverider The CW has released promos for next week’s episodes of The Flash and DC’s Legends of Tomorrow, both of which you can check out in the players below! Titled “Attack on Central City,” Episode 3.14 of The Flash is set to air February 28 and is described as follows: “When Grodd (voiced by David Sobolov) and his army of gorillas bring the battle to Earth-1, The Flash (Grant Gustin) and team must find a way to stop them before they destroy Central City.