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For the eponymous character, see August Heart.

"Enemy At the Gates" is the fifteenth episode of the seventh season of The Flash, and the one-hundred-forty-eighth episode overall. It aired on June 29, 2021.



The episode opens with Barry in his lab at SCPD. He glances up from his work to see Nora there who greets and hugs him. He then wakes up, revealing that seeing her was a dream, before calling Iris to tell her he thinks she might be pregnant.

Later, Barry is about to leave to take Iris's samples to S.T.A.R. Labs as the meta-DNA could mess with normal pregnancy test results when Cecile arrives to give Iris files for a case. She senses something is up with Barry.

At S.T.A.R. Labs, Chester shows Frost the newspaper article detailing Mark's release from prison. She says she doesn't think he can change and become a hero before storming off.

Elsewhere, Joe and Kramer are investigating Adam when they discover a ship registered with Adam's callsign in Midway City. They leave to look deeper into it.

At S.T.A.R Labs, Caitlin works with Ultraviolet however her situation is complicated. Caitlin figures she can fix things, yet Ultraviolet is reluctant to proceed with it. Allegra begs her to rethink. Barry arrives but the lab is occupied so he ends up taking his samples to the SCPD laboratory for testing.

At O'Shaughnessey's, Mark is getting attacked when Frost shows up and saves him. He's badly injured and there isn't anywhere that Frost can take him that he is welcome so she takes him to S.T.A.R. Labs.

Cecile arrives at the SCPD lab and figures out what Barry is testing for. Before the test is finished, the windows get blown in, destroying the samples. Barry and Cecile barely escape.

The group begins to figure things out at S.T.A.R. Labs, finding that there are different Godspeeds causing issues, and they're vanishing as fast as they're appearing. Barry goes to face one of the Godspeeds at the power plant. Mark attempts to get Frost to let him help, yet she says no. Ultraviolet consents to the medical procedure and Caitlin starts to work. Chester is able to decipher what the Godspeed clones are saying and it turns out it was a trap. A number of different Godspeeds appear, forcing Barry to have Chester initiate the Babel Protocol around S.T.A.R. Labs. Barry makes it back just before the force field is secured and the Godspeeds are locked out.

The Godspeeds attempt to overcome the force field around S.T.A.R. Labs. Barry and Chester attempt to concoct a plan since the force field will not stay up forever, however Chester catches Barry talking to Iris on the phone and finds that Barry thinks they are pregnant. Chester then reveals he has an idea to use the unusual language against the Godspeeds. Chester wants to overwhelm them with their own modem talk, causing disarray so the group can bring them down individually.

Frost enrolls Mark's assistance and gives him back his Chillblaine weapons and reveals to him that if that he breaks her trust, he'll never get them back. Cecile uses her powers to help keep Ultraviolet calm while under anesthesia. The Godspeeds figure out how to get through the force field.

The Godspeeds get into S.T.A.R. Labs. Chester hurries to the Time Vault for safety on Barry's orders. Gideon recommends that they adjust Chester's arrangement to pipe the modem talk all through the office since the plan to do it over Central City will not work. Very quickly, the Godspeeds are stunned giving The Flash, Frost, and Chillblaine an opportunity to fight back. One of them blasts into the Time Vault and takes out Gideon, stopping the noise. The Flash baits them all away before they can kill the group.

The Flash is surrounded by Godspeeds, yet another group of Godspeeds appear and they begin fighting each other. The Godspeeds all then vanish.

Ultraviolet endures her medical procedure and is recovering. The Godspeeds barely took of his speed, yet Barry believes that the Godspeeds that came to save him were less about saving him and more about needing to kill the other six. It turns out they may have a Godspeed civil war on their hands.

Frost and Mark discuss what happened that day and Mark reveals he loves Frost. The drink shaker pops and Frost goes to see what happened. When she turns back, Mark is gone.

Back at the SCPD laboratory, Barry runs the tests he had attempted earlier., which come out negative. He questions what's to come.

Outside of Central City, Joe and Kramer are staked out where they hope to find Adam. Kramer is anxious about having to arrest her old friend. While they are talking, Joe sees something and Kramer yells at him to get out of the car. Just as the doors open the car explodes from a missile.



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  • The title, although references the novel Enemy at the Gates: The Battle for Stalingrad, refers to the Godspeed clones breaking into S.T.A.R. Labs.
  • The Babel Protocol is used to protect S.T.A.R. labs again. Having previously been used in "The Last Temptation of Barry Allen, Pt. 2".
  • This is the first episode to feature Nora West-Allen since "Legacy".
  • Cecile's powers have evolved to the point she can even control heartrates by manipulating emotion; which she does to calm Ultraviolet during surgery.
  • Chester P. Runk asks Barry if he has a "Flashmobile". In the Justice League animated series, the Flashmobile was a vehicle purchased by the Flash, making its debut in the two-part episode "Eclipsed".
  • The Godspeed clones appear to be getting stronger, as the Godspeed that Barry fights is able to absorb his lightning punches without much stress, and also seems to be a close match for him.
  • Barry and Cecile Horton mention having monthly Tuesday lunches, a reference to how the show airs on Tuesdays.
  • As stated by Kristen Kramer, this episode picks up a week after the previous one.


  • In the official press release for the episode, Jon Cor's name was misspelt as "John Cor".