Harley and Ivy use the time sphere and visit the future, where they learn of an impending apocalypse.
Tropes:
- Awful Wedded Life: In the future Neytiri comes from, Harley and Ivy spent every waking moment arguing with each other over everything, to the extent that they were too occupied to even name their child.
- Bad Future: Robin has taken over the world and Neytiri's group of rebels are the last holdout of humanity.
- Big Damn Heroes: King Shark's son, King Baby, saves Harley and Ivy from getting frozen at the last minute.
- Chekhov's Boomerang: Joker's sleep apnea from back in "Joker: The Killing Vote" helps Barbara discover and prove his lie about killing Nightwing.
- Cliffhanger: After Harley and Ivy return back to the present, they discover that everything is bleak and in sepia for some reason, then realize they accidentally traveled to September 27 instead of the 21st ("Damn fancy font!"), meaning the apocalypse is a mere six days into the future from their present.
- Credits Gag: Neytiri is listed in the credits as the name Harley renamed her to, "Princess Ladyfingers".
- Even Evil Has Standards: While Doctor Psycho is a sexist villain and his podcast audience is also sexist, he hates to learn from Batgirl that Joker lied about killing Nightwing and took credit for it.
- Face–Heel Turn: While Robin was never the most heroic of the Bat-Family, he eventually becomes the Evil Overlord of the Bad Future, freezing all the heroes and villains, policing the world with drones, and wiping out any resistance.
- Foreshadowing: All the frozen victims without masks are the same ages they were in Harley and Ivy's present time, indicating that the apocalypse started shortly after they stole the Time Sphere, which they discover on their return.
- Freeze-Frame Bonus: Future Damian's frozen collection of supervillains and superheroes includes his own dad.
- The Guards Must Be Crazy: When Harley goes to the security monitoring room of the L.O.D. to see if there's really a doppelganger Harley at Nightwing's death party, Gordon reveals he taped over some security footage to record King Shark's babies.
- Hidden Disdain Reveal: At first Neytiri seems to get along reasonably well with Harley and Ivy after they meet her, but she later sells them both out to Damian in exchange for a bag of dirt. She then reveals that she's always resented them for being terrible parents, since they spent so much time arguing with each other that they neglected her.
- Homosexual Reproduction: Neytiri resembles Harley with Ivy's green skin, implying that she's biologically related to both her mothers.
- Human Popsicle: Future Robin keeps all the heroes and villains frozen as trophies.
- Kid from the Future: Neytiri, Harley and Ivy's future daughter and leader of La Résistance against Robin's regime.
- Mundane Utility: Harley steals the Time Sphere to talk to an older version of Ivy since the present one is too busy.
- Only You Can Repopulate My Race: Played for laughs. Apparently, there were only two men in Gotham City in the future and Harley accidentally killed the hot one. The remaining women aren't happy to be stuck with Steve, and Steve doesn't seem too happy about it either.
- Paper-Thin Disguise: Batgirl hacks into Dr. Psycho's show, hiding her identity by only showing her silhouette while still in costume. Joker recognizes her immediately.
- Parental Neglect: When Neytiri sells them out to Robin, she reveals that Harley and Ivy were terrible moms who spent all their time arguing over things and refusing to communicate, and she was mostly raised by Cheryl instead. Hell, Harley and Ivy got so caught up in trying to decide on a name for their daughter that Neytiri had to come up with her own on the first day of kindergarten.
- People Puppets:
- Ivy uses her vines to tangle up the guard driving the transport truck and manipulate him to drive it for her.
- Tefé can mind control people, which they do to the driver when Ivy's vines get cut.
- Shoehorned Acronym: Volcana insists on making acronyms out of random phrases, much to Ivy's annoyance.
- Shout-Out:
- Harley and Ivy's daughter named herself "Neyteri" from Avatar and she and the rest of the rebels consider the film franchise the greatest and most culturally impactful film franchise of all time. Harley and Ivy are not impressed with this.
- King Baby tells Harley and Ivy that he'd prefer a different film be the most culturally impactful. The film he describes without stating its title is clearly Mamma Mia!.
- Stealing the Credit: It turns out that Joker never killed Nightwing and only took credit for it to help relaunch his villain career. Once the truth comes out, everyone loses respect for him.
- Take That!: One sign of the Bad Future is that Avatar had an actual cultural impact. When Harley and Ivy learn that their future daughter is named Neytiri after the film's lead heroine, they burst out laughing, and Harley even says she barely remembers any of the movie after the only time she watched it.
- Tempting Fate: After getting the Time Sphere back, Harley boasts to Ivy that they'll be able to see the apocalypse coming. Cue them landing six days after their original time and finding that the apocalypse has already begun, making their timeframe vastly shorter than they had originally been told.
- Unobtainium: Since the apocalypse, it seems ordinary, uncontaminated dirt has become this, so it's the only payment Neyteri requires from Robin to sell out her moms. Makes sense if she's part plant like Ivy.
- Who Names Their Kid "Dude"?: When Harley and Ivy's daughter reveals her name is "Neytiri", they both laugh at it and believe they would never name their daughter that, and they're right as Neyteri reveals she named herself because Harley and Ivy were too busy to name her themselves.
