Betcha didn't see that one coming. The Flash's 100th episode, "What's Past Is Prologue," ended with a punch to the gut.
Sherloque had become increasingly wary and suspicious of Iris and Barry's future speedster daughter, Nora, and her time-language journal. In Tuesday's episode, Nora explains to him that it served to record events that could be altered by the timeline, so that she would always remember her dad. However, Sherloque manages to decipher one sentence that doesn't bode well: The timeline is malleable.
If that wasn't ominous enough, Nora later goes to Gideon to send a diary entry and message to a mysterious recipient. She ultimately decides to deliver them herself and races off to Iron Heights… in 2049.
"We need to talk," Nora says as an imprisoned Eobard Thawne — one of her father's deadliest foes — turns around.
"Yes, we do," he replies.
It appears the loving Nora can't be trusted after all.
"In that episode, there's a big reveal where Nora and Thawne are somehow communicating, working together," Parker Kennedy, who plays Nora, acknowledged at a Flash red carpet event in November. "Is it sinister? We're not sure. Is it a good thing? We're not sure. Also, Nora learns things about her father that she didn't know about. They certainly aren't in the Flash museum in the future and its stuff that upsets her. Ultimately, in relationships where you get to know someone, that can be something that brings you closer together."
Showrunner Todd Helbing elaborated on the jaw-dropping twist.
"We knew we wanted to re-introduce Thawne," Helbing explained. "That was part of the pitch to the studio. We wanted him to have a different attitude. That's always been part of the plan. And, we wanted to do more of an act one, two, three. Having 22 episodes with the same villain becomes very difficult. In Season 1, Thawne was integrated into the group, so you could slowly pull back. This season will hopefully be more satisfying."
"Overall, we wanted to change the tone a little bit," he continued. "I think we went a bit too light, or jokey, in Season 4. We really did want to get back to the Season 1 tone. I think people think of Season 1 as the lightest version, but it's really not. Thawne is darker than anyone. What we realized is you can have someone like Cicada be very dark, as long as our team is having a good time and enjoying themselves and not so bogged down by the darkness. It's sort of the best recipe."
As if Nora conspiring with the Reverse-Flash didn't sting enough, Team Flash's strategy to defeat Cicada failed. However, they did gain a vital piece of information in the process.
"There's a really big confrontation with Team Flash," Chris Klein, who plays the villain, explained. "They've got a plan to separate Cicada from his dagger. Without his dagger, he is rendered powerless, just like with his dagger, everybody is rendered powerless. They put that plan into action. It results in a massive fight. Then, it ends with all of us learning that Killer Frost is immune to Cicada's dagger. It's just as much news to Cicada as it is to Team Flash."
"We come to this wonderful fork in the road and a wonderful turning point in the story. It's really about to get interesting," he continued. "Now, we're at the point in the season where we've learned everything there is to learn. Now, the chase is on and the clock is ticking. It gets really exciting."
"This villain, he's just a gritty, working-class dude who has a goal," Klein explained. "Cicada has nothing to lose. He's not in it for any other reason than it's the right thing to do. And, what an interesting struggle that is. He believes it's the right thing to do. The writers have done a fantastic job of bringing that conflict to the forefront."