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"Success Is Assured" is the nineteenth and final episode of the sixth season of The Flash, and the one-hundred-thirty-third episode overall. It aired on May 12, 2020.



Eva McCulloch's protective suit

Eva McCulloch

As Eva McCulloch dons a new suit to accommodate for years in another dimension, Mirror David Singh is on the phone with the mayor, thanking the mayor for understanding he needed leave time to be with his ill mother while she recovers; "everything i am came from her, after all". The two decided that all that Joseph Carver has must be destroyed before he dies.

Team Flash has a meeting at the police precinct, since Barry Allen doesn't want to add his job to everything else he has recently lost. During the meeting, Ralph Dibny reveals the Black Hole diamond he got from Sue Dearbon; Allegra Garcia notes that it emits radiation. Focusing the emissions, she helps the team to find a warehouse that Black Hole uses for storage. When the Flash and Elongated Man arrive, they see Mirror Singh has killed the security guards and is about to set the place ablaze. Mirror Singh succeeds.

Dearbon family

Dearbon family.

The game plan now changes to the protection of Carver from his deranged wife. Caitlin Snow cannot participate though, as Carla Tannhauser has arrived to take her daughter away to heal. The two decided to heal their relationship as Frost wants to be closer to her as well.

At a Black Hole safe house, Eva captures Sunshine, Ultraviolet, and Dr. Light, and transports them to the Mirrorverse.

In the Mirrorverse, at its version of S.T.A.R. Labs, Iris West-Allen and Kamilla Hwang discuss how to find David Singh; though Kamilla has not adapted, Iris begins to itch and, every-so-often, begins to see what appears on reflective surfaces. With his meta-humans gone, Carver goes to Team Flash for protection. At the precinct while they wait for an A.R.G.U.S. transport, the team and Carver encounter Mirror Singh he proposes to exchange Iris for Carver. As Barry listens, Nash Wells pushes Singh away and teleports the team back to S.T.A.R. Labs. He argues with Barry that he is beginning to act less than heroic, citing that Barry was willing to kill him in order to be rid of Eobard Thawne.

Eva infiltrates Joseph's panic room

Eva infiltrates Joseph's panic room.

Meanwhile, Sue has reunited with her parents, but has become a Black Hole operative to keep them safe. When Team Flash takes Carver to McCulloch Technologies to protect him there, Sue is present, plotting to double-cross and kill him herself.

Suddenly, Eva McCulloch's team arrives. Team Flash assume they are mirror duplicates, but the trio reveal that Eva convinced them to help murder Carver to liberate themselves from the blackmail he's been using to keep them under his control. Carver sends his security guards to assault the women causing a melee that eventually brings Team Flash into the fight. The Flash is protecting Carver from Eva; Eva succeeds in killing Carver. With Carver dead, the fight is over.

Iris suddenly disappears

Iris suddenly disappears.

Carver's death causes Joe West no longer to need to be in witness protection; he and Cecile Horton join the team as Barry feels bad about his failures.

Sue is jubilant that Carver is dead; Ralph informs her that Eva had a press conference, blaming her for Carver's death.

In the Mirrorverse, Iris has a moment of clarity and locates the real David Singh. Suddenly, as Kamilla panics, Iris glows and disappears.



Guest starring[]






  • The title references the mantra frequently repeated by the mirror duplicates to Eva McCulloch which in-turn was inspired by the phrase from the Wright brothers.
  • Due to the COVID-19 pandemic,[1] Grant Gustin revealed in an interview with TVLine that this episode serves as the sixth season finale.[2]
    • Also, the episode has a different cliffhanger than planned, as the original season finale was going to have an Eobard Thawne-based cliffhanger for the next season.[2]
    • Since the season was cut short, this marks the first season finale where Carlos Valdes (Cisco Ramon) is absent.
      • This probably notes that during the events of this episode, Cisco was possibly at Atlantis trying to get the component for the perpetual motion machine in which in the previous episode ("Pay the Piper") it was mentioned that the component was located in Atlantis.
    • At the end of the episode, the "To Be Continued.." was shown to prepare for the next season.
  • 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 major protagonist doesn't get killed. The first was the Season 4 finale "We Are The Flash".
  • This is the last episode of The Flash to feature Hartley Sawyer (Ralph Dibny) as a series regular due to being fired on June 8, 2020 as a result of offensive tweets resurfacing.[3]


  • Nash 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.
  • In the mirrored McCulloch Technologies, the secret room behind the mirror is accessible by a button on the right hand side. However, in the real world, the button is still on the right when it should be on the left.