The Flash Season 2 Episode 17: Flash Back

A new episode of The Flash, titled "Flash Back," airs tonight on The CW!

A MOMENT IN TIME GETS BARRY ONE STEP CLOSER TO ZOOM; ANDY MIENTUS RETURNS AS HARTLEY RATHAWAY – After the shocking revelation that Zoom is Jay Garrick (Teddy Sears), Barry (Grant Gustin) is more determined than ever to get back to Earth-2 to stop Zoom forever. Desperate to find a way to increase his speed, Barry decides to travel back in time and masquerade as his earlier self in order to get his arch-nemesis, Dr. Harrison Wells/Eobard Thawne (Tom Cavanagh), to teach him how to run faster. However, things don't go as planned and Barry is stunned to face familiar foe Hartley Rathaway (guest star Andy Mientus), as well as old friend Eddie Thawne (guest star Rick Cosnett). Iris (Candice Patton) makes peace with her past in order to embrace her future.

Watch clips, a featurette and a trailer for the episode in the videos below.

Have you seen Dawn of Justice yet? If so, go rate it in the ComicBook.com Movie Database for a chance to win your very own Armored Batman figure!

Batman v. Superman: Dawn of Justice is now playing in theaters.