Watch The Flash Season 1 Episode 19 - Who Is Harrison Wells?

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The FlashAir date: April 21, 2015

Episode Guide

Season 01
Episode 1 City of Heroes October 07, 2014
Episode 2 Fastest Man Alive October 14, 2014
Episode 3 Things You Can't Outrun October 21, 2014
Episode 4 Going Rogue October 28, 2014
Episode 5 Plastique November 11, 2014
Episode 6 The Flash Is Born November 18, 2014
Episode 7 Power Outage November 25, 2014
Episode 8 Flash vs. Arrow (1) December 02, 2014
Episode 9 The Man in the Yellow Suit December 09, 2014
Episode 10 Revenge of the Rogues January 20, 2015
Episode 11 The Sound and the Fury January 27, 2015
Episode 12 Crazy for You February 03, 2015
Episode 13 The Nuclear Man February 10, 2015
Episode 14 Fallout February 17, 2015
Episode 15 Out of Time March 17, 2015
Episode 16 Rogue Time March 24, 2015
Episode 17 Tricksters March 31, 2015
Episode 18 All-Star Team Up April 14, 2015
Episode 19 Who Is Harrison Wells? April 21, 2015
Episode 20 The Trap April 28, 2015
Episode 21 Grodd Lives May 05, 2015
Episode 22 Rogue Air May 12, 2015
Episode 23 Fast Enough May 19, 2015
Season 02
Episode 1 The Man Who Saved Central City October 06, 2015
Episode 2 Flash of Two Worlds October 13, 2015
Episode 3 Family of Rogues October 20, 2015
Episode 4 The Fury of Firestorm October 27, 2015
Episode 5 The Darkness and the Light November 03, 2015
Episode 6 Enter Zoom November 10, 2015
Episode 7 Gorilla Warfare November 17, 2015
Episode 8 Legends of Today (1) December 01, 2015
Episode 9 Running to Stand Still December 08, 2015
Episode 10 Potential Energy January 19, 2016
Episode 11 The Reverse-Flash Returns January 26, 2016
Episode 12 Fast Lane February 02, 2016
Episode 13 Welcome to Earth-2 February 09, 2016
Episode 14 Escape from Earth-2 February 16, 2016
Episode 15 King Shark February 23, 2016
Episode 16 Trajectory March 22, 2016
Episode 17 Flash Back March 29, 2016
Episode 18 Versus Zoom April 19, 2016
Episode 19 Back to Normal April 26, 2016
Episode 20 Rupture May 03, 2016
Episode 21 The Runaway Dinosaur May 10, 2016
Episode 22 Invincible May 17, 2016
Episode 23 The Race of His Life May 24, 2016
Season 03
Episode 1 Flashpoint October 04, 2016
Episode 2 Paradox October 11, 2016
Episode 3 Magenta October 18, 2016
Episode 4 The New Rogues October 25, 2016
Episode 5 Monster November 01, 2016
Episode 6 Shade November 15, 2016
Episode 7 Killer Frost November 22, 2016
Episode 8 Invasion! (2) November 29, 2016
Episode 9 The Present December 06, 2016
Episode 10 Borrowing Problems from the Future January 24, 2017
Episode 11 Dead or Alive January 31, 2017
Episode 12 Untouchable February 07, 2017
Episode 13 Attack on Gorilla City (1) February 21, 2017
Episode 14 Attack on Central City (2) February 28, 2017
Episode 15 The Wrath of Savitar March 07, 2017
Episode 16 Into the Speed Force March 14, 2017
Episode 17 Duet (2) March 21, 2017
Episode 18 Abra Kadabra March 28, 2017
Episode 19 The Once and Future Flash April 25, 2017
Episode 20 I Know Who You Are May 02, 2017
Episode 21 Cause and Effect May 09, 2017
Episode 22 Infantino Street May 16, 2017
Episode 23 Finish Line May 23, 2017
Season 04
Episode 1 The Flash Reborn October 10, 2017
Episode 2 Mixed Signals October 17, 2017
Episode 3 Luck Be a Lady October 24, 2017
Episode 4 Elongated Journey Into Night October 31, 2017
Episode 5 Girls Night Out November 07, 2017
Episode 6 When Harry Met Harry… November 14, 2017
Episode 7 Therefore I Am November 21, 2017
Episode 8 Crisis on Earth X, Part 3 November 28, 2017
Episode 9 Don't Run December 05, 2017
Episode 10 The Trial of The Flash January 16, 2018
Episode 11 The Elongated Knight Rises January 23, 2018
Episode 12 Honey, I Shrunk Team Flash January 30, 2018
Episode 13 True Colors February 06, 2018
Episode 14 Subject 9 February 27, 2018
Episode 15 Enter Flashtime March 06, 2018
Episode 16 Run, Iris, Run March 13, 2018
Episode 17 Null and Annoyed April 10, 2018
Episode 18 Lose Yourself April 17, 2018
Episode 19 Fury Rogue April 24, 2018
Episode 20 Therefore She Is May 01, 2018
Episode 21 Harry and the Harrisons May 08, 2018
Episode 22 Think Fast May 15, 2018
Episode 23 We are the Flash May 22, 2018
Season 05
Episode 1 Nora October 09, 2018
Episode 2 Blocked October 16, 2018
Episode 3 The Death of Vibe October 23, 2018
Episode 4 News Flash October 30, 2018
Episode 5 All Doll'd Up November 13, 2018
Episode 6 The Icicle Cometh November 20, 2018
Episode 7 O Come, All Ye Faithful November 27, 2018
Episode 8 What's Past is Prologue December 04, 2018
Episode 9 Elseworlds, Part 1 December 09, 2018