This week's episode of The Flash was a smorgasbord of cameos, Easter eggs, and cliffhangers. Showrunner Andrew Kreisberg recently opened up about the episode, "The Fury of Firestorm," and dropped some hints about what's to come later in the season.
“We have these ideas in the previous season so we always knew we were leading up to this, and rather than them suddenly having some cousin that inexplicably…" Kreisberg told Variety regarding the decision to make Wally West Iris West's brother instead of her nephew.
"We always hated on TV shows that it’s year two and somebody’s like, ‘Well, Cousin John’s coming!’ And it’s like, ‘Oh, good ol’ Cousin John!’ who no one ever mentioned before. It was always weird. The notion that they don’t know Wally was where that came from, and then that was the idea that Francine was still alive and then that whole storyline. Iris is now in the position that Barry was in last year – she’s keeping a secret to protect somebody and she’s going to find that, for all of her anger at Barry and Joe from last year, keeping this secret is not going to be so easy and it’s going to be weighing on her before she finally decides to take some action in an upcoming episode.”
Kreisberg also confirmed that Wally is indeed the son of Joe West, putting to bed any nascent conspiracy theories.
One of the biggest surprises of "The Fury of Firestorm" was the intervention of Earth 2 Harrison Wells. Kreisberg confessed that, while the next episode would not pick up exactly where "Firestorm" left off, Earth 2 Wells's nature would be a big topic moving forward.
“The next episode opens in a slightly surprising way," Kreisberg explained. "I’m a fan of ‘Doctor Who.’ I think one of the things that Steven Moffat always does so brilliantly is that when he has cliffhangers and two-parters, they don’t just pick up exactly where they left off. You come in with an expectation and ‘oh wait, now I’m not quite where I thought I was going to be.’ Obviously, this scene will play out. but how it unfolds in 5, I think the beginning of 5 is really exciting. You’re going to get a lot of answers to questions you have.”
Kreisberg stopped short of confirming whether this was the true Harrison Wells of Earth-2, or a version of Eobard Thawne.
Kreisberg also said that there would be more Earth-2 doubles appearing in the season.
“With time travel last year, we kind of tried to ease everybody into it and we tried to do the same thing here where the first episode was how the two guys look exactly alike and then Jay comes over and we establish the idea of Earth-2, and then we’ve had it playing in the background for episodes three and four just to remind everybody that the show is still The Flash and you’re still going to get the typical Flash episodes that tie into the normal mythology of the show. And now we’re really going to pick up, with 5 and with 6 and 7, the Earth-2 storyline. There will be doppelgangers and doubles.”
As for what else fans can expect moving forward, Kreisberg says more returning villains are on the way, confirming reports that Grodd would return later in the season, making Caitlin "Fay Wray to his King Kong."
However, Kreisberg says fans should not hold their breath for the return of Killer Frost, saying the plot line would be a "slow burn." He also said that, while the show likely could not afford an entire King Shark episode, referring to the surprise villain cameo at the end of "The Fury of Firestorm," there is an Earth-1 King Shark in Flash's world.
The Flash airs Tuesday nights on CW.