" Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."
This episode is part of a larger crossover series,
" If "
Gotham can handle the Batman, they can handle the Green Arrow. — Barry Allen
"Elseworlds, Part 2"
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December 10, 2018
Elseworlds, Part 2
" is the ninth and midseason finale episode of the
, and the one-hundred-forty-seventh episode overall. It aired on December 10, 2018.
The episode is the second part of the three-part crossover,
, with the ninth episode of the Elseworlds fifth season of , and the ninth episode of the The Flash fourth season of .
Oliver and Barry still stuck in the other’s bodies, the two get a lead on John Deegan and head to Gotham City with Supergirl to figure out why their reality has changed. While there, they meet the mysterious Kate Kane who provides them with information that leads the group to Arkham Asylum.
The episode was previously titled "Hour Two".
 Some of the locations in Chicago that were filmed in this episode were the same locations used in The Dark Knight trilogy to replicate Gotham City.
This episode marks the very first time in the Arrowverse where Batman is mentioned by name on-screen.
Bruce Wayne, who was mentioned before in " ", is also mentioned several times in the episode.
Tribute This episode features many references to Batman:
The inmate rooms inside of Arkham Asylum contained nods to several Batman villains on each door including: Oswald Cobblepot (The Penguin), Pamela Isley (Poison Ivy), Basil Karlo (Clayface) and Edward Nigma (The Riddler).
Despite the references to the Batman villains, there was one name on an inmate's room that instead referenced writer and former showrunner Marc Guggenheim.
Arrow The WiFi password Kate gave to Oliver, Barry and Kara is "Alfred", which is a reference to Batman's butler, Alfred Pennyworth.
Digger Harkness' boomerang, Bane's mask from , The Dark Knight Rises Hugo Strange's sunglasses, the Riddler's cane, the Penguin's umbrella, and other items can be seen inside of Deegan's lab.
Barry asks if a ride in the Batmobile is out of the question, referencing Batman's vehicle from the comics.
Kara finds a William Shakespeare bust in a box which is a reference to the 1960's TV series where it has a button to the entrance of the Batcave.
Batman When Oliver mis-aims a lightning bolt, the gas released falls out of a box labelled "Crane, J". This is a reference to Jonathan Crane (The Scarecrow), one of Batman's greatest villains.
Nora Fries takes a freeze ray from a glass case that's labeled "Fries, V". This is a reference to her husband Victor Fries (Mister Freeze), one of Batman's greatest villains.
A Gotham police officer mentions Nolan and Burton streets. This is an homage to Christopher Nolan, who directed the three films in the , and Dark Knight Trilogy Tim Burton, who directed and Batman .
Batman Returns When Supergirl says goodbye to Batwoman, she says that they both would have been a good duo, to which Batwoman replies as the "World's Finest". This is a reference to a crossover in the comics between Batman and Superman named where they both team up.
World's Finest The Earth-90 Barry points out that the John Diggle of Earth-1 doesn't wear a ring like his Earth-90 counterpart. This is a reference to John Stewart, who in the comics is one of the characters who wear the Green Lantern Ring and becomes Green Lantern.
Barry narrates the opening introduction (using the name Oliver Queen) due to the altered reality where he's Oliver Queen/Green Arrow. This monologue would later be used as the mid-Season 7 intro.
At the end of the episode, the Monitor reveals that he is preparing them for a "Crisis". This ties in with the red skies emerging in the first two parts of the crossover. Both are a reference to the Crisis story arc, which includes Crisis on Infinite Earths, Infinite Crisis, and Final Crisis.
The scene were Earth-90 Barry Allen was trying to tell them about the book of The Monitor while stuck in the portal might have been a nod to when future Barry Allen in that film was trying to warn Bruce Wayne in the present.
Batman v Superman: Dawn of Justice When Barry, Kara, and Oliver go to A.R.G.U.S. and tell John and Curtis that Barry and Oliver have swapped lives, John says " An immortal Egyptian, aliens, parallel Earth Nazis; I have no idea why I'm not even surprised at this point." These are references to three previous crossover events; , Heroes Join Forces , and Invasion! , respectively.
Crisis on Earth-X