"Who have we been working for this whole time? Dr. McGee said that after the accident, Wells became a completely different person. It's because he is a different person."
Team Flash learning "Wells" was never Wells and that he's someone completely different
"Who is Harrison Wells?" is the nineteenth episode of the first season of The Flash, and the nineteenth episode overall. It aired on April 21, 2015.


Joe and Cisco head to Starling City to continue their investigation of Dr. Wells. While in town, the duo enlists the help of Captain Lance and Cisco meets the Black Canary, who asks him for a favor. Meanwhile, back in Central City, Barry races to catch a meta-human named Hannibal Bates who can transform himself into every person he touches – which includes Eddie, Iris, Caitlin and even The Flash.[1]


Preparation ran from February 2 until February 11, 2015. Shooting ran from February 12 until February 24, 2015.[2]


  • The billboard "Welcome to Coast City" represents Ferris Air which in DC Comics, employs the Modern Age Green Lantern Hal Jordan.
  • Quentin tells Joe that Laurel has kept something from him for months. Even though he doesn't mention what it is, he is referring to Laurel keeping Sara's death a secret from him, which was a major event in Season 3 of Arrow, which takes place in conjunction with the first season of The Flash.




  1. Flash Episode 19 Spoilers: “Who Is Harrison Wells?” Description - FlashTVNews
  2. Andrew Kreisberg (@AJKreisberg) - Twitter