The Loop (TV)
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- "I'm gonna save Wally."
"How exactly are you going to do that?
"I'm going back into the Speed Force."
- —Barry Allen and Julian Albert
|Desperate to stop Savitar and save his friends, Barry turns to the speed force for answers to rescue Wally. H.R. gives Jesse some advice.|
- Grant Gustin as Barry Allen/The Flash
- Candice Patton as Iris West
- Danielle Panabaker as Dr. Caitlin Snow
- Carlos Valdes as Cisco Ramon/Vibe
- Keiynan Lonsdale as Wally West
- Tom Cavanagh as H.R. Wells
- Jesse L. Martin as Detective Joe West
Special appearance by
Special guest stars
- Robbie Amell as Ronnie Raymond
- Rick Cosnett as Eddie Thawne
- Wentworth Miller as Leonard Snart/Captain Cold
- H.R. refers to the Speed Force as a "Negative World", to which Cisco is surprised that Earth-19 has Super Mario. They are presumably referring to the Minus World, a level in the very first Mario video game that is often regarded as one of the most well known glitches in video game history.
- Cisco exclaims "By George, I think he's got it!", closely quoting a line popularized in the 1964 film My Fair Lady.
- This episode features 5 speedsters, more than any other episode of the series: Barry Allen/The Flash/Savitar, Wally West/Kid Flash, Jesse Wells/Jesse Quick, Jay Garrick/The Flash, and Hunter Zolomon/Black Flash.
- Julian classifies Savitar's blade as an unknown material, akin to a Luttinger liquid. A Luttinger liquid is a material of strongly interacting electrons, confined to one spatial dimension. Such materials have indeed unusual properties and clearly deviate from ordinary metallic behavior.
- As he is "vibing" Barry into the Speed Force, Cisco says "to infinity and beyond", the famous catchphrase of the toy space ranger Buzz Lightyear from the Toy Story franchise.
- H.R. mistakes the Peanuts character Schroeder with the famous thought experiment Schrödinger's cat. He then remarks how on his Earth it is Charlie Brown that plays the piano.
- When Jesse suggested that Savitar's blade would find its way back to him, Cisco likened it to the 1999 film The Iron Giant, which ends with the title character's parts pulling themselves together to rebuild him.
- The scene where Barry is entering the S.T.A.R. Labs portion of the speed force and Caitlin is singing the lullaby "Hush, Little Baby" resembles the beginning of a flashback sequence Batman Beyond: Return of the Joker in which Batman walks through a building as Harley Quinn sings the same lullaby.
- When asked by the Speed Force, as Eddie Thawne, on his arrival again, Barry tells that he's there to save Wally, to which the Speed Force replies, "Ever the hero, huh, Barry?". This is a reference to "Rogue Air", in season 1 of The Flash, where Eobard Thawne uses the exact same line between his talk before his fight with Barry Allen, Firestorm (Martin Stein and Ronnie Raymond) and Oliver Queen.
- The Speed Force, as Leonard Snart, comments that Jay was getting slow in his "golden age", referencing the period of comics in which Jay originally appeared.
- This is the second time Barry goes into the Speed Force, the first being in the Season 2 episode "".
- H.R. saying "He's not a god, he's just a man, baby!" closely follows the line "That ain't no woman, it's a man, baby!" from Mike Myers's character in the 1997 film Austin Powers: International Man of Mystery.
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