Spoiler warning for any Flash fans who haven't yet completed Season 4.
With its time-travel scenarios, its multi-powered heroes and big bads, its metaphysical realms and more, The Flash is a TV show that doesn't usually offer authoritatively exhaustive explanations for a lot of its complex storylines and reveals. But while past seasons usually relied on shocking unmaskings and villainous monologues to tie all the dots together, Season 4 left quite a few dangling issues that made us feel like we were unwitting victims of the Enlightenment.
Follow us through a list of the unanswered questions and unresolved plotlines that The Flash viewers were left with when Season 4 ran its final end credits. Some will likely get answered in Season 5, and some will hopefully get hinted at before then. Unfortunately, I suspect a couple may not ever get properly sorted out. Let's start off with a mystery that technically formed at the end of the Season 3 finale. (And if you're looking for a deeper look at the "Thomas" mystery, we've got you covered.)
What Actually Happened With Barry In The Speed Force?
Once Team Flash was finally able to free Barry from his six self-sacrificed months trapped inside the Speed Force (using a DNA orb that the Speed Force is a dolt for accepting), it was clear that Barry had gone through some things in ways unlike Wally's Groundhog Day nightmare and Jay Garrick's normalish stint. He seemingly relived past events (that apparently weren't affected by Flashpoint) and also tapped into his own future (and we're still wondering about those "diapers"), and not all of it has been explained yet. Were those precognitive glimpses tied to how the dark matter worked on the doodle-marked Clifford DeVoe? And will that Speed Force engagement continue evolving The Flash's powers? He is already proficient in the stopping-time thing. Also, will that play into Nora's own potential wraith-attracting time-travel woes, and how Barry tries to keep her safe?
What Are Barry And Nora's Symbols About?
When Barry was yanked out of the Speed Force way back in the Season 4 premiere, he was bearded and spouting gibberish that mostly didn't make sense (at the time), and he was drawing bizarre symbols all over every flat surface he had access to. The Flash went on to explain some of his gobbledygook -- including the immortal "This house is bitchin' line -- but the images are still a mystery. We do know that Nora has some knowledge of them, as one episode revealed she has a notebook filled with the same kind of symbols her dad was scribbling. Although her connection to the symbols may point toward their origin in the Speed Force, The Thinker also seemed to have a connection to them, and he presumably hadn't been in and out of the Speed Force like the speedsters. More Nora in Season 5 will hopefully mean more answers.
Where Did The Thinker's Consciousness Go?
The Flash spent a LOT of time on The Thinker boasting about imminent victories, with his expansive deductions making failure impossible, and he always seemed to finalize development on Plan C and a Plan D just as Team Flash was figuring out Plan A. DeVoe's powers allowed him to telepathically control others, shape-shift, switch meta-powers into other bodies, and move his consciousness into other people, and he was even able to port himself into electrical devices for a comic-teasing digi-Thinker. But we're really supposed to believe that Thinker's grand defeat involved Marlize unplugging his chair? No, not on The Flash, where even Ralph Dibny gets a second shot at life. I wouldn't be surprised at all to learn that DeVoe is now inside Marlize's mind, or that someone is going to power that chair up again in the future, granting The Thinker artificial intelligence.
What Are Caitlin's Repressed Memories?
Caitlin Snow had a rough ride in Season 4, as it usually goes.. After coming to terms with her Killer Frost persona, she lost access to those powers, though there's still a lot going on inside Caitlin. Cisco use his Vibe powers to take Caitlin back to a recently resurfaced childhood memory, which revealed she'd manifested Killer Frost powers as a child, long before the particle accelerator exploded and created The Flash and many other Central City metas. In the memory, a voice (presumably belonging to her father) calls out to her not to look at her reflection. Now, the big questions are all swirling around those repressed memories. How and why did she repress them? Why are they coming back to her now? Is Killer Frost responsible for what memories she does and does not have access to? Do they even have the same memories?