History YMMV / BatmanTheAnimatedSeriesE6TheUnderdwellers

* OneSceneWonder: The Sewer King, a single one-shot villain who is a VictorianLondon-esque [[Literature/OliverTwist Fagin]] villain transplanted to Gotham is popular, all the more so since he's the one bad guy in the original series that makes Batman visibly contemplate killing then and there.

* MoralEventHorizon: The Sewer King crosses the line by kidnapping children to use as slave labor and steal things from him. He trained them to be severely photophobic and afraid of adults. He also scares them with his trained crocodiles and makes it forbidden for the children to make a sound, punishing them by shoving them into a tiny little room with bright lights without food or water for hours -- and sometimes, he does it on a whim, even to a kid who managed not to utter a peep despite the extreme scare tactics. He was one of the few villains Batman had seriously considered killing on the spot, and that's saying quite a lot.

* CompleteMonster: The Sewer King stands out in a show boasting numerous, multifaceted villains with redeeming qualities and often tragically sympathetic motives because he has neither.

* MoralEventHorizon: The Sewer King crosses the line by kidnaping children to use as slave labor and steal things from him. He trained them to be severely photophobic and afraid of adults. He also scares them with his trained crocodiles and makes it forbidden for the children to make a sound, punishing them by shoving them into a tiny little room with bright lights without food or water for hours -- and sometimes, he does it on a whim, even to a kid who managed not to utter a peep despite the extreme scare tactics. He was one of the few villains Batman had seriously considered killing on the spot, and that's saying quite a lot.

* SomeAnvilsNeedToBeDropped: Batman chastises Frog for RecklessGunUsage, noting that children and guns don’t mix, and that while the gun ''wasn’t'' loaded, it ''could have'' been. Many children have died after finding and playing with their parents’ guns, and one of the most basic rules for firearm safety is to “treat every weapon as if it is loaded.”

* OneSceneWonder: The Sewer King, a single one-shot villain who is a VictorianLondon-esque [[Literature/OliverTwist Fagin]] villain transplanted to Gotham is popular, all the more so since he's the one bad guy in the original series that makes Batman visibly contemplates killing then and there.

* SomeAnvilsNeedToBeDroppes: Batman chastises Frog for RecklessGunUsage, noting that children and guns don’t mix, and that while the gun ''wasn’t'' loaded, it ''could have'' been. Many children have died after finding and playing with their parents’ guns, and one of the most basic rules for firearm safety is to “treat every weapon as if it is loaded.”

* HarsherInHindsight: Batman says the Sewer King is worse than Joker for his treatment of the orphans. Come ''Return of the Joker''...

* HarsherInHindsight: Batman says the Sewer King is worse than Joker for his treatment of the orphans. Come "Return of the Joker"...