Elongated Man protects Central City in The Flash episode 4.11 promo Following the return of the series last night, The CW has released the first promo for next week’s episode of The Flash where Hartley Sawyer’s Ralph Dibny must protect the city while Barry is behind bars. Check it out in the player below! Titled “The Elongated Knight Rises,” the episode is set to air Tuesday, January 23 on The CW and is officially described as follows: “When a familiar villain returns to terrorize Central City, Ralph (guest star Hartley Sawyer) must rise up to defend the innocent while Barry (Grant Gustin) is detained by his trial.