New Extended Promo For THE FLASH Season 2 Episode 17: "Flash Back"

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. Alice Troughton directed the episode penned by Aaron Helbing and Todd Helbing (#217).

Last year, the S.T.A.R. Labs Particle Accelerator exploded, creating a dark matter storm that struck forensic scientist Barry Allen — bestowing him with super-speed and making him the fastest man alive. But Barry wasn’t the only person who was given extraordinary abilities that night. The dark matter also created meta-humans — many of whom have wreaked havoc on the city. With the help of the S.T.A.R Labs team, Caitlin Snow, Cisco Ramon and Dr. Harrison Wells, Barry protects the people of Central City from these powerful new threats as The Flash. Following the defeat of Allen's arch-nemesis Eobard Thawne (aka Reverse Flash), Team Flash must quickly turn their attention to the singularity swirling high above Central City, consuming everything in its path. Armed with the heart of a hero and the ability to move at super speeds, Barry charged into the eye of the singularity, but can he actually save his city from impending doom?