After Nora is erased from existence, Barry and the rest of Team Flash have to deal with the consequences of the newly altered timeline while the Crisis on Infinite Earths looms.
Tropes specific to The Flash (2014) Season 6 are as follows:
- Arc Words: "A world without the Flash." Barry is trying to prep his team and the world for when the Crisis comes and Barry meets his prophesied end.
- Big-Bad Ensemble: This season has two Big Bads, one for each half of the season, as well as the looming threat and subsequent fallout of the Anti-Monitor in the Crisis on Infinite Earths, this year's crossover, which is set to play a much larger role than the previous crossovers. The first half of the season has Dr. Ramsey Rosso, aka Bloodwork, as the main villain, though Barry is (for the most part) more preoccupied with the Monitor's prophecy of his fate in the Crisis during Rosso's time in the chair.
- Black Blood: Ramsey Rosso/Bloodwork's powers manifest as a dark black liquid, as opposed to the comics, where he is quite literally made of bright red blood.
- At the beginning of the premiere, a version of Godspeed is running around 2019 Central City. Since Nora isn't there to stop him in the new timeline, imperfect clones/test subjects of his are in present-day Central City.
- Iris notes that the original article about the Red Skies Crisis involved Barry fighting Thawne rather than an attempt to combat the Anti-Monitor.
- The Final Temptation: The two-episode arc, "The Last Temptation of Barry Allen," is this for Barry (duh) just before he expects to die in the Crisis on Infinite Earths, during which Bloodwork tempts Barry with the prospect of a life with Iris and baby Nora if Barry gives into Ramsey's infection, which would (technically) allow him to survive the Crisis.
- Foreshadowing: Jay Garrick's antimatter tracking map in "A Flash of the Lightning" shows that the next antimatter wave is expected at Earth-2. Earth-2 is promptly destroyed at the end of Arrow's Season 8 premiere, "Starling City," hours after the episode aired.
- Internal Reveal: Barry learns in the premiere that he is destined to die in the crisis, not simply disappear as the article stated. Barry and Iris also learn in the same conversation that the Crisis has been moved up to December 10th, 2019.
- Like You Would Really Do It: The Monitor tells Barry and Iris in the season premiere that in order to survive the Crisis, "Flash must die." However, the show was renewed for a full season, Barry sits the events of the fifth episode out, and Oliver is also fated to die in the Crisis on Infinite Earths under much more likely circumstances, all of which imply that Barry is going to make it out of the Crisis.
- Screw Destiny: Iris takes this stance relative to the Crisis, insisting to Barry that since the Crisis hasn't happened yet, they can still prevent Barry's deathnote , but Barry resigns to his fate after seeing that only one timeline resulted in Iris's and the others' survival, and that was the one timeline where Barry sacrifices himself to stop the Crisis.
- Stepford Smiler: Barry and Iris originally act like they are relatively unbothered by Nora's erasure at the beginning of the season and act like they simply got some time with adult Nora before actually having her as a child, but eventually the two break down by the end of the premiere, with Barry throwing himself into his work as the Flash and Iris eventually breaking down crying that it won't be the same Nora. It gets even worse once the two find out Barry is destined to die in the upcoming crisis, courtesy of the Monitor, and Barry sees billions of timelines, all but one resulting in the erasure of everyone Barry cares about except for one timeline where he sacrifices himself instead.
- Timey-Wimey Ball: Par for the course with the show, obviously, but major timeline changes take place after the end of Season 5 due to Thawne's manipulations to the timeline, including the Crisis on Infinite Earths happening on December 10th, 2019, not in 2024, as the article had originally read. Nora is also erased from existence, obviously, as a result of the timeline changing after Cicada's dagger was destroyed, which is a major part of Barry and Iris's character arcs this season, with the two grieving heavily over the loss of their child.
- Tragic Keepsake: Nora's will, originally, but eventually Barry and Iris settle for Nora's jacket after the Monitor destroys the former.
- You Can't Fight Fate: The Monitor appears at the end of the season premiere to let Barry and Iris know that the former is destined to die in the Crisis on Infinite Earths. Initially, the two refute this possibility, but after Barry mentally projects his consciousness to the time of the Crisis, he sees that the only possible timeline that Iris and the others survive is the one timeline where Barry sacrifices himself, and resigns himself to the fact that he has to die.