Subtitles The Flash S02E17 – Flash Back

Season 02, Episode 17 –  “Flash Back”
Barry becomes determined to get back to Earth-2 to stop Zoom, but he realizes he needs to increase his speed. He travels back in time and masquerades as his earlier self to get his arch-nemesis Dr. Harrison to teach him how to run faster. But while there, Barry faces familiar foe Hartley Rathaway and old friend Eddie Thawne.