Alternate Character Interpretation: Livewire. Now, the main view is that she's a belligerent mean-spirited bigot who became a supervillain and she has no right to be angry with Superman, having "saved her life after all." However, her last facial expression conveys the emotional expression of someone anticipating, with glee, a lethal event. And not only did Superman steal that from her, he ultimately robbed her of her biological humanity. Of course, it was her own stupidity that got her there in the first place...
Angst? What Angst?: For someone who came out of cryosleep (which for her would be like going to sleep and suddenly waking up) and finding out the rest of her family is dead, her world is now a complete lifeless husk, and she's been trapped on ice for years, Supergirl seems to take things remarkably well. Possibly justified in that what she had to endure before was like hell and Smallville farm (plus superpowers) must seem like heaven.
Animation Age Ghetto: Most of the series was made to the producers satisfaction, but they were forced to change Supergirl's introductory episode (See What Could Have Been on the trivia page) and obscure Maggie Sawyer's sexuality (See Hide Your Lesbians on the main page) because they were deemed inappropriate for a children's show.
Broken Base: The 'Legacy' two part series finale. Was it an awesome, emotional, action packed, bittersweet finale to the series or was it a rushed, sloppily written mess filled with plot holes and firm grasps on the Idiot Ball that shouldn't have been made as the finale? While most lean towards the former point of view, the later has gained popularity in recent years
While not quite to the extent of Kevin Conroy and Mark Hamill (as Batman and Joker, respectively), Clancy Brown is often seen as having one of the definitive interpretations of Lex Luthor, perfectly mixing a fierce thuggishness with haughty megalomania.
The same counts for Dana Delany as Lois Lane, particularly because Delany has regularly voiced Lois over the years, and her voice-acting handles Lois' snark incredibly well.
"Girl's Night Out", the episode of the DCAU featuring Batgirl and Supergirl against Poison Ivy, Harley Quinn, and Livewire is commonly thought to be a STAS episode, but in reality it is officially a Batman: The Animated Series episode, according to both the episode list on the official website and the fact that it was on the BTAS Volume 4 DVD rather than Volume 3 of STAS (which included the last third of the series, including Supergirl's debut).
"Knight Time" (where Superman teams up with Robin to find out what happened to a missing Batman, even impersonating him briefly) is similarly confused as a BTAS episode.
Darkseid, the Evil Overlord of Apokolips and the Ultimate Evil of the DC Animated Universe, turned his home planet into a hellhole and seeks to do the same with Earth. He is a being utterly incapable of love or empathy for anyone. He handed over his adopted son, Scott Free, to be tortured and brainwashed by Granny Goodness, treated his loyal son, Kalibak, like garbage, and attempted to outright kill his other son, Orion while joking about it. Darkseid is also fond of conducting Cold-Blooded Torture and killing minions for failing him, or even for questioning him. Over the course of Superman: The Animated Series and Justice League Unlimited, Darkseid tried to conquer earth no less than three times. The first time he’s defeated he compensated by personally murdering Dan Turpin just to cause Superman pain. The second time, he brainwashed Superman into leading Darkseid’s armies against his adopted world, turning the Man of Steel into a pariah for years. His third and final attempt stems not for a desire for power, but solely to make Superman suffer. There’s a reason why Darkseid is one of the only villains Superman outright tries to kill.
“I hope you appreciate, Kal-El, that everything that happens from this point is on your head. The skies will rain fire, the oceans will boil, the streets will run red with the blood of billions. Only then, after your last pitiful hope is extinguished, will I end your life.”
Brainiac is a robotic psychopath and collector of data who views himself as superior to all organic life. Once the supercomputer responsible for running Krypton's day-to-day affairs, Brainiac lied to the Council of Elders about the planet's impending doom, prioritising saving himself over preserving the lives of his creators. Escaping into space, Brainiac roams from world-to-world, assembling all of a planet's information, and then destroying the original in order to increase the value of his stolen memories; his objective is to repeat the process across the universe until he has "destroyed all of creation". Along the way he murders the crew of a spaceship that was investigating his presence, tries to steal Superman's body for himself, and eventually, after fusing with Lex Luthor, tries to wipe out the entire universe in one fell swoop, aiming to rebuild it in his own image. Void of remorse, and possessed of a bodycount in the billions, Brainiac cared for nothing but his own survival, and his mission of bringing about "the end of all things."
The second episode has a passenger plane hit with a missile and nearly crash into Metropolis. To make it worse the missile was fired by a terroristnote okay so they're more like mercenaries but everyone called them terrorists in the episode. Similarly, the first part of "The World's Finest" has a scene where terrorists take over Air Force One.
The finale of "World's Finest" has the Joker firing missiles on multiple buildings, sending them crashing to the ground.
In the same episode, Martha wants to give Clark and Lana some alone time so they can talk. So she tells Jonathan that Dukes Of Hazzard is on. And who plays Jonathan Kent a couple years later in Smallville? John Schneider, of course.
Another Smallville related one in the same episode: young Clark informs Lana Lang about how he is seeing through things, she asks if he's looked towards the girls locker room. This ended up becoming Hilarious in Hindsight just five years later, when in the Smallville episode "X-Ray," Clark discovers his x-ray vision by accident and ends up inadvertently seeing into the girls locker room...directly at Lana.
In "Knight Time", Brainiac's line to Superman disguised as Batman, "You are every bit the detective your followers on the Internet believe.", has gotten funnier in light of the rise of social media sites like Twitter and Facebook and their copious use of the Memetic Badass trope.
In the episode "Bizarro's World" a nuclear missile detonates a few miles above Metropolis. A few months later, in "Apokolips... Now!, Part 1", a nuclear power plant melts down just off the coast. To put it mildly, the cancer rate in Metropolis is about to become... impressive.
Don't forget the Joker's rampage in "World's Finest". He blew up quite a few buildings before he was taken down.
Really everything Darkseid does is this he gives weapons to Intergang that cause considerable damage to Metropolis, attempts an class-4 Apocalypse How on Earth, and later an class 5 by crashing a comet into it to wipe out it without breaking his treaty with New Genesis, and in the finale brainwashes Superman and turns him against Earth.
In Parasite's debut episode, when he starts absorbing Superman's energy right in front of a crowd a female bystander watching screams "Good Heavens" in a Dull Surprise manner, coming off as a little silly in an otherwise serious scene.
"Prototype" has the infamous moment where Superman is temporarily blinded by the insane Sergeant Mills, leading to a bunch of sporadic piano music to start playing, but instead of coming off as creepy it's unintentionally hilarious - as is the way Superman gets smacked around by Mills while blinded.
Superman's Roaring Rampage of Revenge on Apokolips in Legacy comes to an unintentionally hilarious halt when the Furies appear and Superman actually tries to ignore them after he got done killing a bunch of Parademons with his heat vision, so they just attack him anyway and he actually lets them cling to him as they try to kill him and he continues to allow them to go on attacking him until he just crashes into a nearby statue. His encounter with Granny Goodness is also pretty bad and ends up not being as chilling as it was meant to be. TV censorship at its worst.
The Scrappy: Considering the way he thought Superman "betrayed" him in the finale and his subsequent Face–Heel Turn in Justice League Unlimited, it's highly doubtful you'll find someone who likes Professor Hamilton ever again. Bruce Timm stated in his Modern Masters book that THEY didn't like Professor Hamilton in the first place. That's why, when debating who Darkseid should kill, they finally came up with Dan Turpin, because they weren't allowed to kill Ma and Pa Kent and they felt if they killed Professor Hamilton it wouldn't have any impact, because they never liked him anyway.
Squick: In "The Main Man," Lobo defeats a giant snakelike creature by ripping its skin clean off its body, exposing the pulsating veins underneath.
They Wasted a Perfectly Good Character: Volcana; introduced as an Anti-Villain with a sympathetic motivation, who had interesting interactions with Superman. All of this is only explored in her debut episode, and all her appearances after that in the DCU despict her as a straight villain who only cameos.
Lois Lane in "Target". She's put herself in danger multiple times, but at least usually she didn't know how dangerous it was or at least tried to take some kind of precaution. Here she knows exactly how dangerous her unknown enemy is and she's actually has police protection. During a phone conversation with Clark she suddenly realizes who's trying to kill her. What does she do? She sneaks off to confront them face to face. While Clark and everyone else still thinks she's under police protection. If it hadn't been for Luthor just happening to call Clark to give him a vital piece of information she would have been dead by the end of the episode.
In "The Main Man," Lois goes after Lobo with a metal pipe...after she's already seen him shrug off multiple punches from Superman.
Pre-Livewire Leslie Willis for thinking it was a good idea to hold a gathering of her fans in the middle of a storm. Look where that got her...
The Janitor who hands his Walkman headphones to Livewire in "Double Dose." There's a "No Electronics" rule for a reason, pal. For that matter, the security guard who takes said janitor's watch, but fails to also collect the Walkman. How do you miss that?