Season 3 of The Flash ended on a major cliffhanger, leaving fans with plenty of questions. The CW series isn’t set to return until October, but viewers are already busy speculating about what’s to come. Here are seven new rumors about Season 4, from the potential villain to the latest on Barry Allen’s (Grant Gustin) fate:
1. The Thinker could be the new big bad
As showrunner Andrew Kreisberg first revealed at the 2017 PaleyFest, Season 4 will mark the first time that The Flash won’t have a speedster as the primary villain. So who will Team Flash be battling this season?
According to TVLine, Barry’s next adversary will be Clifford DeVoe, aka The Thinker. As fans know, the series hinted at the character’s future introduction in a couple of Season 3 episodes – including the finale, in which Savitar surveys S.T.A.R Labs and states, “This is where we came up with the cerebral inhibitor … to use against DeVoe.”
If DeVoe is the new big bad, it’s safe to say Barry will have his work cut out for him. In DC Comics canon, DeVoe is a failed lawyer who starts a new career as the brain behind the dealings of other criminals. He employs various scientific devices to wield the powers of mind control and telekinesis. He also once accepted a mission with the Suicide Squad in exchange for a full pardon.
2. Season 4 could start with a time jump
Season 3 ended with Barry Allen voluntarily putting himself in Speed Force limbo in order to save Central City. Though producers have not commented on how soon Season 4 will pick up after that, it’s likely that the show’s upcoming season will take place several months into the future.
Candice Patton, who plays Iris West on the series, seemingly confirmed the theory recently, telling TVLine, “[The Oct. 10 premiere] takes place six months in the future, and we still don’t have Barry out of the Speed Force. Iris is really struggling to deal with that, and she does it in her own way.”
3. Wally West may have taken over the Flash mantle
With Barry trapped in the speed force, he will likely be MIA at the very start of Season 4. But the city won’t be without a hero. Wally West’s Kid Flash is still around, and with Barry away for the time being, fans are already speculating that he will take over the Flash mantle — at least temporarily.
It’s unlikely that Barry will miss too much of Season 4 (the show is called The Flash, after all), but it makes sense for Wally to step in during his absence. If Season 4 does pick up with a time jump, we can likely expect to hear some conversations (and potentially see some flashbacks) about Wally’s heroic ventures during those months without Barry.
4. Season 4 might be based on the Rebirth story arc
A now-deleted July tweet from the account of The Flash production office seemed to reveal the Season 4 premiere title: The Flash Reborn. The tweet immediately kicked off speculation that Reborn is a nod to the 2009 six-issue series, The Flash: Rebirth.
Written by Geoff Johns (who is also an executive producer on the show), Rebirth follows as Barry Allen returns from the Speed Force and is transformed into speedster villain, Black Flash. The show already tackled the Black Flash, with Hunter Zolomon (Teddy Sears) taking on the character in Season 2, during which he was killed by Killer Frost (Danielle Panabaker). If the show wanted to present a new Black Flash, Barry certainly has the potential to show off a darker side (as we saw in Season 3), but producers have already confirmed that the primary antagonist won’t be a speedster.
Another possibility? There’s a different comic book story operating under an almost identical title, known as DC: Rebirth. The 2016 run follows Barry as he becomes a mentor to a new set of speedsters after a Speed Force storm (one that looks suspiciously similar to what viewers saw in the Season 3 finale) leaves several new friends and foes with powers.
Whether the upcoming season will take inspiration from either of these stories remains to be seen, but fans should stay tuned, as more details will likely be revealed in the coming weeks.
5. Earth-2 Wells may return
Tom Cavanaugh has played many, many different versions of Harrison Wells at this point. But last season’s iteration, Earth-19’s goofy but lovable H.R., died in the Season 3 finale. So does that mean there will be no Wells in Season 4?
Fans shouldn’t lose hope yet. In the Season 3 finale, Barry asked Earth-2’s version of Wells, known as “Harry,” for his help. Hopefully, that means Harry will be sticking around S.T.A.R. Labs next season.
6. We could see a different side of Killer Frost
Season 3 saw Caitlin Snow battling against, and ultimately surrendering to, her evil Killer Frost persona. But the finale, in which Killer Frost joins Team Flash in defeating Savitar, proved that parts of Caitlin’s kind-heartedness are still in there. So what version of the character will we see in Season 4?
As viewers saw in Season 3’s final episode, Caitlin decided against taking Julian’s antidote, meaning her powers are still intact. So could she use those powers for good instead of evil? Though controlling her powers has been a struggle for her on the show so far, Killer Frost has previously worked for the good guys in the comics. In Justice League vs. Suicide Squad, she is recruited by Batman to join the Justice League, after nearly sacrificing her life in a heroic move during battle.
On the heels of her role in taking down Savitar, there’s a chance that fans could see Killer Frost making a change and using her powers in a more positive manner in Season 4. But whether she’ll be able to suppress her Killer Frost urges for long is a whole different question.
7. A Wonder Woman villain may show up
Eagle-eyed viewers noticed a great Wonder Woman Easter egg in the penultimate episode of The Flash Season 3. While walking past several cells that once held the members of the Suicide Squad, Barry also sees holding blocks with the names Cupid, Grodd, and Cheetah.
As loyal Arrowverse fans know, Cupid has appeared on a number of episodes of Arrow, while Grodd has been a recurring foe to The Flash. But Cheetah has never appeared on either show before and is actually best known as one of Wonder Woman’s most notorious adversaries.
First appearing in Wonder Woman #6, the supervillain boasts feline characteristics and has appeared in various versions throughout the years, joining villainous groups like the Injustice League and the Secret Society of Super Villains.
So could this be a hint that Cheetah will appearing in Season 4 of The Flash? As of now, it remains unclear whether the name-drop was a subtle nod to the show’s comic book roots or a legitimate teaser of what’s to come. However, the series has a history of featuring a variety of famed rogues from the DC Universe, so it wouldn’t be out of the realm of possibility to see Cheetah pop up in a future episode.
The Flash returns to the CW on Tuesday, Oct. 10 at 8 p.m. Eastern.