A two-part "special". In Part 1, the Titans invade the Hall of Justice to use the Justice League's pool after Cyborg breaks theirs. In Part 2, the Titans have to rescue the League from Darkseid.
- Evil Sounds Raspy: The Titans are initially intimidated by Darkseid and his gravely voice. When it turns out he just had a sore throat and starts speaking like "Weird Al" Yankovic, the Titans lose all respect.
- The Greatest Story Never Told: After their attempts to break the Justice League out of their containment pods all end in failure and a necessary time-rewind, Robin suggests that they just leave the pods there for another superhero to save. Cyborg is upset, because it means the League will never know his role in saving them and ask him to join them, but Robin states that he'll become a proper League member some day (and, as the Time Skip proves, he's correct).
- Hero-Worshipper: Cyborg admits that he's always wanted to join an upscale superhero team like the Justice League, and acts incredibly awkward when the other Titans force him to take a tour of the Hall while they're there.
- Hypothetical Fight Debate: Robin claims that Darkseid could beat any other superhero one-on-one, with the other Titans suggesting fights. The exception is when Beast Boy suggests Spider-Man, as Robin just claims there's no way those two would ever fight.
- Leaning on the Fourth Wall: Robin spends plenty of time hyped up that today is "special" even though he doesn't quite know why, alluding to how this is a two-part special.
- Multi-Part Episode: As their titles indicate, "Two Parter" takes place across two episodes.
- People Jars: Darkseid kept the main five League members he kidnapped in suspended animation containment pods, rigged to drop into the lava when he's defeated or self-destruct when opened.
- Self-Deprecation: Cyborg recognizes that Darkseid's sounds like Weird Al, and remarks that there's no way they can take him seriously now. Darkseid (who really is voiced by Weird Al) then goes on a rant about how he respects how evil Weird Al is, purposely plagiarizing other musicians and then mocking them with their own melodies.
- Shout-Out:
- Cyborg claims that the Green Lantern power ring has the power to summon anything you can imagine, but the only thing he summons is the cast of The Golden Girls.
- When the other Titans first learn that their main threat is going to be Darkseid, everyone but Robin asks if they should change their outfits to fit in Star Wars, mistaking the situation for fighting the Dark Side.
- Part 2 ends with Cyborg explicitly referencing Superman: The Movie when, after defeating Darkseid but accidentally killing a League member when pods either fall into lava or self-destruct, Cyborg races around Apokalypse fast in the opposite direction in order to reverse time.
- Spotting the Thread: The robot security drone in the Hall of Justice almost lets the disguised Titans go, until it realizes that Cyborg states he's "Green Lantern" instead of identifying which Green Lantern he is.
- Time Skip: The episode ends with one twenty years later, with Cyborg as a member of the Justice League and the other Titans playing ding-dong ditch with the League's front door.
- Vocal Dissonance: Darkseid's real voice is that of "Weird Al" Yankovic. Turns out his menacing voice is all because he had a cold.
- Wig, Dress, Accent: In order to get past the Hall's security, the Titans break into the closet and dress as League members, with Robin being Batman, Raven being Wonder Woman, Beast Boy being Martian Manhunter, Starfire being the Flash, and Cyborg being a Green Lantern.
