The Flash's 100th Episode Revealed The Key To Defeating Cicada

Killer Frost Danielle Panabaker The Flash The CW

Warning! The following contains spoilers for The Flash episode "What's Past Is Prologue". Read at your own risk!

Team Flash went through hell and back to devise a strategy to defeat Cicada, and it almost ended up being all for naught until another factor came in play that could be the key to defeating the Season 5 villain. Apparently, Caitlin and Killer Frost are immune to Cicada's dagger's powers and could end up being the game-changing factor in what will bring about his defeat.

Things kicked off when Nora worked out a grand adventure through the show's past to construct a device capable of defeating Cicada's dagger. If all went according to plan, Team Flash could "time hack" and hide the device so that they could access it in the future. It was a bold gambit, but the best idea the team believed they had at stopping Cicada. The dates were laid out, and Barry and Nora went to make the plan work.

Of course, things didn't go as smoothly as the duo hoped, but Barry and Nora eventually made their way back and went off with Ralph and Cisco to confront Cicada at the hospital. Things seemed to be swinging Team Flash's direction, especially after Cisco was able to vibe the dagger into space. Unfortunately Cicada was still able to pull the dagger back and ended up sapping Team Flash of their powers.

Things took a sharp turn after that, and everyone was on the ropes as Cicada had the clear advantage over everyone. The villain had the speedster right where he wanted him, but before he could strike a killing blow, he was slammed against a van by a cool blast. The forceful wind came from none other than Killer Frost, who is apparently immune to the effects of Cicada's dagger.

CinemaBlend's Deputy TV Editor Laura Hurley spoke to actor Chris Klein during the red carpet event for the 100th episode about the big reveal, and he explained how big the moment is for Team Flash, as well as for Danielle Panabaker's character.

I can tell you that that hit on the van there at the end sure looked painful! I was happy it was a trained stuntman doing that. What's really cool is in the hundredth, Team Flash finally figures out that they might have a way to stop this guy. And in order to do that, they're going to have to ask Caitlin to really dig in, and it's something that she's been resisting to do, and it's a wonderful arc for her character. A wonderful start of an arc for her character, and it's a wonderful climax to the chase in the hundredth episode. But they have a long way to go, they gotta figure out exactly how to make that work and everything. So it's a really fun turn.

A big arc for Caitlin and Killer Frost? It sounds like The Flash team listened when Twitter sounded off after Caitlin lost her powers last season. Caitlin will now play a meaningful role in the defeat of Cicada, although Chris Klein teased it won't be as simple as freezing him and calling it a day. Perhaps that trip to the past will end up doing more harm than good after all.

The Flash is about to go on break, but not before a new episode to kick off the "Elseworlds" crossover on The CW Sunday, December 9 at 8:00 p.m. ET. Keep tabs on what all is happening on television around and beyond that date with our handy fall and midseason premiere guides.

Mick Joest
Content Producer

I like good television but also reality television. His day largely consists of balancing his workload between reporting on the latest and greatest news in Star Trek and other sci-fi, as well as 90 Day Fiancé, WWE, Big Brother, and more.