"Look Iris, I'm barely hanging on. I can't catch my breath, I'm getting dizzy, my feet are numb, my fingers tingle. It feels like with every step I take I'm being ripped in two. All I can think about is if I'll be fast enough tomorrow to save another life."
Barry Allen on his quickly declining speed because of the death of the Speed Force.
"So Long and Goodnight" is the sixteenth episode of the sixth season of The Flash, and the one-hundred-thirtieth episode overall. It aired on April 21, 2020.


After Black Hole hires Rag Doll to kill Joe, Singh suggests he go into Witness Protection but Joe refuses to stop investigating Carver. While investigating Carver with Cisco, Ralph runs into Sue. Iris becomes suspicious of Eva.[src]



Guest starring




  • Originally set to air on March 31, 2020, it was pushed back to accommodate the halted production of every other TV show from the ongoing COVID-19 coronavirus pandemic.[1]
    • After being pushed to April 7, the episode was delayed yet again. Reruns of Crisis on Infinite Earths aired during that week instead.[2]
    • On March 30th, 2020, The CW released a graph of returning shows, confirming both The Flash and DC's Legends of Tomorrow would return on April 21 with new episodes.
  • On April 20th, one day before the release of the new episode, it was leaked online.
  • There is a mention of Prince during the episode that aired on the fourth anniversary of his death.
  • This is the second episode to not feature Danielle Panabaker (Caitlin Snow) after "A Girl Named Sue".
  • The title of this episode is a reference to the scene where Mirror Iris kicks Barry out of their apartment.
    • This is actually wrong for how the fight went; Barry owns the apartment. So the correct version would be him kicking Mirror Iris out for being unreasonable; the owner is supposed to kick out the other person.
  • In one scene, the financial adviser asks Sue if she and Ralph are married, to which they both reply "gross". In the comics, the two of them are married.
  • The song used at the end of the episode is "Razor" by Foo Fighters.
  • The scene where Joe almost got killed is a bit similar to what almost happened to Wild Dog in the Season 6 finale of Arrow in which Wild Dog and some FBI agents were looking for Ricardo Diaz inside of a building in which it reveals to be planted with explosives by which Wild Dog thought he would die right there until he managed to escape with the FBI agents and the same thing happened with Joe in which he thought that he was going to die until he ended up disarm the explosive that was tied to the chair he was on and manage to escape just before Barry showed up.


  • Iris tells Eva that Barry is the Flash, but from Iris' perspective, Eva should not even know who the Flash is given that she has been trapped in the Mirrorverse ever since the particle accelerator explosion.




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