- "The lesson I have prepped for today is much more simple. Life 101: there are no happy endings."
- —Clifford DeVoe to Barry Allen
|Amunet kidnaps Caitlin and puts meta-dampener handcuffs on her to keep her from turning into Killer Frost. Amunet tells Caitlin she needs her to perform a tricky medical task and if Caitlin fails, Amunet will kill her. Meanwhile, The Thinker traps The Flash in a speedster-proof prison. With the clock ticking, The Team doesn't have the time or resources to track both Caitlin and Barry so Iris is forced to choose who to save.|
"Don't Run" starts with Team Flash designing STAR Labs, preparing for Christmas.
At the Allen living arrangement, Barry and Iris and open up their last wedding endowments. Barry goes to tidy up the entirety of the wrapping paper, when Iris sees he hasn't been utilizing his forces much as of late. When inquired as to why, Barry says he feels that he doesn't have to utilize his forces when around Iris.
At the Devoe family unit, Clifford is making some hard memories fastening his cardigan — we discover that his strong degeneration is quickly spreading.
Caitlin — irritated with Dibny's remarks about inclining toward Killer Frost prior — is having espresso with Wells at Jitters when the entryway is separated by Amunet, who needs to "talk with" Caitlin. She takes Caitlin from Jitters.
Somewhere else, Barry and Iris are assaulted by Devoe, who's prepared as The Thinker, complete with his seat what not. He's ready to rapidly overwhelm Barry, before taking him hostage.
Iris strolls into the lab and tells the remainder of the group that Barry's been taken. Joe reacts with disclosing to her Caitlin's been taken also.
Cisco takes a stab at vibing Barry's area, however is thumped back by some psionic-like forces. He state he's seen nothing like it, when talking about the area Barry's being kept.
We see Barry in The Thinker's sanctuary; he's encircled by a type of intensity hosing power field.
We discover that Amunet has taken Caitlin to a temporary clinic room in a distribution center. Amunet needs Caitlin's assistance attempting to spare the life of another metahuman that Amunet shot. Subsequent to taking steps to slaughter both the new metahuman and Caitlin, the last consents to assist.
The new metahuman — Dominic — awakens from the sedative Amunet utilized, and we discover he has clairvoyant capacities. Caitlin consoles him that she'll do whatever she can to help spare him, however says the result looks depressing.
Back at The Thinker's den, Devoe shows up and shows himself to Barry. Barry gives finding a shot The Thinker's endgame, yet the doorbell rings — Joe West has shown up.
Joe goes into the family, and Clifford approaches him without his super-suit or seat. Devoe reveals to Joe that he realizes that he has reinforcement outside the entryway, and Wells strolls inside the entryway.
A disappointed Joe says he's going to leave and get a court order, so, all things considered Devoe permits him to look through his home.
Back at the den, Devoe's significant other — The Mechanic — has drawn nearer Barry, who's attempting to stage through the power field divider. Barry has a go at getting more data through her, however she doesn't move.
Wells strolls back in STAR Labs and tells the gathering that they looked through Devoe's entire house and discovered nothing. Dibny and Cisco — who are both baffled — nearly get into a battle, and must be isolated by Iris.
Cisco and Dibny leave the lab, and Wells approaches Iris and reveals to her that in light of the fact that their assets are so constrained, it may be the better move to pick between which of the two missing colleagues — Barry or Caitlin — they should concentrate the entirety of their assets on.
Back at the emergency clinic room Amunet is keeping Dominic in, Caitlin discloses to him the earth isn't the perfect spot to play out the medical procedure. Caitlin reminds Dominic that he has clairvoyant capacities, and proposes they utilize the forces to get away. They have a go at running towards the entryway, yet are before long halted by an improvised door shaped by Amunet.
Amunet advises a couple of cohorts to look out for Dominic while she pulls Caitlin aside. Amunet fills Caitlin in on the scalawag's past both preceding and following the atom smasher blast. She at that point repeats her request for doing the procedure on Dominic.
Dibny's attempting to get Cisco's satellite to work when the last methodologies. The two rapidly present appropriate reparations and apologize to one another. Not long after, Iris strolls in and berates the pair to turn the Speed Force satellite, since they're going to concentrate their assets on discovering Caitlin.
Back at Amunet's place, Caitlin begins the procedure on Dominic. She's ready to separate the metal from his neck, yet once she does, Dominic starts slamming.
We discover that Dominic faked the situation as path for the two to get away. They come up short on the office and are welcomed by Cisco and Dibny, who salvage the pair and take them to security.
Back at Devoe's nest, Barry's figured out how to vibrate out of his cell. That move prompts a pursuit grouping among Barry and The Thinker. Barry's ready to fix Devoe's seat to crash in the waterway, and can come back to STAR Labs.
The gathering collects and attempts to discover Devoe or his significant other, yet their facial acknowledgment programming can't get anything.
Joe makes reference to that he'd even now prefer to host a Christmas get-together and welcomes the entire group over to praise the special seasons. Dibny approaches Caitlin and apologizes for the remarks about inclining toward Killer Frost prior.
There's a thump on the entryway, and it's Dominic. Simultaneously, Barry gets an approach his telephone, and the security alert at his office is going off. He dashes off to perceive what's happening.
Glancing through his space for something topsy-turvey, Barry's telephone rings once more. This time, it's Dominic, and it's uncovered that The Thinker has moved his cognizance into Dominic's body.
Through the discussion, we discover that The Thinker has put his old body — which has been wounded — in Barry's condo, which outlines Barry for the homicide of Clifford Devoe. Sooner rather than later, Captain Singh and a SWAT group breaks into the loft and captures Barry for the homicide.
- Grant Gustin as Barry Allen/The Flash
- Candice Patton as Iris West-Allen
- Danielle Panabaker as Dr. Caitlin Snow
- Carlos Valdes as Cisco Ramon/Vibe
- Neil Sandilands as Professor Clifford DeVoe/Thinker
- Tom Cavanagh as Dr. Harry Wells
- Jesse L. Martin as Detective Joe West
Special guest star
- Hartley Sawyer as Ralph Dibny
- Patrick Sabongui as Captain David Singh
- Kim Engelbrecht as Dr. Marlize DeVoe
- Kendrick Sampson as Dominic Lance/Brainstorm and Professor Clifford DeVoe/The Thinker
- Jessica Camacho as Cynthia/Gypsy
- The title is a reference to Barry's final line as the CCPD show up to arrest him.
- Cisco likens Harry to Ebenezer Scrooge and the Grinch. In reply, Harry claims that "you're a mean one, I wouldn't touch you with a 39-and-a-half-foot pole", quoting the song "You're a Mean One, Mr. Grinch" from the 1966 TV special Dr. Seuss' How the Grinch Stole Christmas!.
- When Amunet prevents Caitlin from transforming into Killer Frost, she quips that "Frosty melted away", referencing the 1969 TV special Frosty the Snowman in which the protagonist is in danger of melting.
- Cisco calls Amunet an "evil Mary Poppins", referencing her English accent.
- The Flash suit is revealed to have kept the life-raft function that Cisco installed earlier and showed off in "".
- When DeVoe (disguised as Dominic Lanse) goes to describe the West house, Cisco suggests "bitchin'", a callback to the season premiere, "", in which a decoded message from a discombobulated Barry reads "This house is bitchin'".
- DeVoe gains the ability of telepathy through his transferring his mind and consciousness into the body of Dominic. In the DC comics, Clifford DeVoe originally the ability of telepathy, although Barry Allen is immune to telepathy.
- The Thinker tells the Flash, "You should learn to lose every once in a while, Bar. A little humility will prepare you for what lies ahead." These are actually the Thinker's last dying words to Jay Garrick, the original Flash in the comics.
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