History WesternAnimation / BatmanTheDoomThatCameToGotham

** Grendon says, "Hark, the lurker is on the threshold" a reference to ''The Lurker on the Threshold'' by Creator/AugustDerleth.

* HollywoodAcid: Bruce uses 'concentrated chlorine' to destroy the monster that Talia.

* ClarkKenting: Averted; Oliver recognises Bruce despite him being dressed up as Batman.

* {{Bifauxnen}}: Kai Li is dressed like her surrogate brothers, with the exception of a buttoned collar with jewel choker.
* BlackVikings: Lucius Fox runs Wayne Enterprises despite being a Negro, which he can only get away with by pretending he's relaying Mr. Wayne's instructions to the board of directors. Later Kai Li inherits the Wayne Foundation, despite being Asian. Of course, [[ScrewTheRulesIHaveMoney people are willing to tolerate a lot when you're rich.]]

* DeadGuyOnDisplay: Bruce Wayne returns to his family home after 20 years away, only to find Langstrom's body has been left there for him to find. He later realises that Talia left it there to get him to investigate Langstrom and find the hidden TomeOfEldritchLore she needs.

* FailedASpotCheck: As he's busy trying to fend off TheSwarm of mutant birds, Bruce fails to see the supposedly frozen creature reach out its tentacles and deposit the 'seed' inside Grendon's mouth.

* HeroicBSOD: Bruce appears to have gone mad after two of his wards die and the full scale of what he's up against sinks in. Lucius wants to get him treated at Akham Aslyum, and Kai Li finds Bruce [[NotHelpingYourCase dressed in a bat costume]] and demanding answers from Langstram's corpse. Fortunately her news that Oliver Queen--who also seems to have gone mad--knows something about what's coming, is enough to put Bruce back on the case.

* AdaptedOut: Tim Drake, replaced by the original character Kai Li.

** Bruce's reaction when Talia siccs yet another monster on him. He's also NotSoStoic on seeing Blood transform into a fiery demon, though he quickly regains his stoicism after Etrigan jumps out (or rather, [[ThereWasADoor through]]) the window.

* TakeUpMySword: Before leaving for the final act, Batman entrusts the [[InsistantTerminology wine cellar]] to Kai Li. She's later shown to have inherited the Wayne Foundation which is rebuilding Gotham.

* MadOracle: Averted; Barbara Gordon is confined to Arkham Asylum, but that's because of her medical condition--confined to a wheelchair and speaking and breathing through a chest tube and artificial diaphram. She actually prefers it there. "If you saw as I do, you'd take the insanity within these walls over the true madness out there."

* MadOracle: Averted; Barbara Gordon is confined to Arkham Asylum, but that's because of her medical condition--confined to a wheelchair and speaking and breathing through a chest tube and artificial diaphram. She actually prefers it there.

* TakeUpMySword: Before leaving for the final act, Batman entrusts the [[InsistantTerminology wine cellar]] to Kai Li.

* HeroicBSOD: Bruce appears to have gone mad after two of his wards die and the full scale of what he's up against sinks in. Lucius wants to get him treated at Akham Aslyum, and Kai Li finds Bruce [[NotHelpingYourCase dressed in a bat costume]] and demanding answers from Langstram's corpse. Fortunately her news that Oliver Queen--who also seems to have gone mad, but knows something about what's coming--is enough to put him back on the case.

** Bruce's reaction when, during his seance, he finds his own father was involved in these events.
** Bruce is NotSoStoic when he sees Blood transform into a fiery demon, though he quickly regains his stoicism after Etrigan jumps out (or rather, [[ThereWasADoor through]]) the window. Then it happens again when Talia sics first a demon, then a mutant monster on him.

* IHaveManyNames: When he transforms into his OneWingedAngel form, Ra's claims to be, or possibly birthed from, Hastur the Unspeakable and Cthulhu.

** Bruce is NotSoStoic when he sees Blood transform into a fiery demon, though he quickly regains his stoicism after Etrigan jumps out (or rather, [[ThereWasADoor through]]) the window.

* SinsOfTheFather: Oliver knows it was his own father that murdered the Waynes, and carries a lot of guilt over this DarkSecret. Bruce Wayne discovers his father, along with Cobblepot, Queen and Langstram, where the founders of Gotham who were given immortality, but in doing so doomed the world to destruction.

** Bruce is NotSoStoic when he sees Blood transform into a fiery demon, though he quickly regains his stoicism.

* SinsOfTheFather: A discussed trope. Oliver knows it was his own father that murdered the Waynes, and carries a lot of guilt over this. Bruce Wayne discovers his father, along with Cobblepot, Queen and Langstram, where the founders of Gotham who were given immortality, but in doing so doomed the world to destruction.
-->'''Bruce Wayne:''' He died trying to do what was right.
-->'''Kai Li Cain:''' He died because he thought he owed the world for whatever insanity his dad--
-->'''Bruce Wayne:''' Oliver believed the sins of the father--
-->'''Kai Li Cain:''' Are heaped upon the son. Yeah, I know what verse. But don't forget Ezekiel 18. "The son will not share the guilt of the father, nor will the father share the guilt of the son."
* TakingYouWithMe: Once mortally wounded, Oliver resorts to blowing up Poison Ivy with a grenade.

* OutsideContextSituation: Bruce has spent decades preparing to fight crime in Gotham, only to find his studies have made him ill-prepared for the supernatural.

* InternationalTeam: The three orphan 'Robins' that Bruce has adopted as his wards, to reflect how he's been WalkingTheEarth (or rather sailing the Earth) while studying criminology and developing his skills to become The Bat.

* MultinationalTeam