"Stand down. Joseph is dead."
"Well...I didn't see that coming.
—Eva McColloch and Nash Wells
"Success Is Assured"[1] is the nineteenth and final episode of the sixth season of The Flash, and the one-hundred-thirty-third and most recent episode overall. It aired on May 12, 2020.


Barry considers a risky plan to save Iris from the Mirrorverse. Ralph attempts to stop Sue from making a grave mistake that could destroy her life.[src]



Guest starring



  • This is the first season finale where the main season antagonist was not defeated by Team Flash; however, this is due to this episode not originally being written as a season finale.
    • This is the second season finale where a main character doesn't get killed. The first was the Season 4 finale.


  • Nash Wells shouldn't make an appearance at CCPD because the police who are working there could have recognized him as Harrison Wells because of what happened in Season 1 in which Eobard Thawne was supposed to turn himself in because of his crimes such as the creation of the Particle accelerator and the murder of Nora Allen.
    • However, it's possible Barry could have explained Nash being Harrison Wells' twin like he did with Hartley, though it is unknown when he could have done this.
      • This could be the excuse HR used in the alternate 2024.
    • Given Nash's expertise in adventuring, he is very good at sneaking around and not getting noticed.
    • Given it's been over five years since then and Harrison Wells was declared dead, it's not far-fetches for people to think it's simply mistaken identity; there's the old concept that some people have (non-multiverse) "dopplegangers" out in the world.




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