One of the things that quickly turned viewers of the pilot episode of the Flash into fans was a scene at the very end that showed Harrison Wells (Tom Cavanagh) looking at a hologram of a future newspaper with a headline that read: "Flash Missing: Vanishes In Crisis." This, of course, was both long-term setup for the series and a reference to the first-ever event series in comics, Crisis on Infinite Earths from Marv Wolfman, Jerry Ordway and George Perez. It was also one of the biggest moments in the Flash history, as Barry Allen sacrificed himself to save the worlds. Every Flash fan who saw that headline was hooked.
Actor Grant Gustin, who plays Barry Allen, told comicbook.com at a convention this weekend that the series is still moving towards Crisis in the distant future:
"We don't really talk about on a yearly basis but it was mentioned early on and that's a goal. Obviously, we'd have to go I think ten years to reach that. So there's a possibility for sure. It'll be fun to get there."
The paper returned to prominence this last season after Barry saw Irish West (Candice Patton) die in the future. He noticed that the byline listed a different name and he continued to use it to check and see if any of the changes he made to the timeline would save her.
Though the Flash has had a lot of great stories over the years, there have been very few Flash-centric events — Flashpoint and Crisis being the top two. And since the series moves in real time, we won't be getting to Crisis for another seven years. There's a good chance we'll see more references to it over the years, as long as the series continues. Flash season 10…the Antimonitor.