Beast Boy, a normally comedic character, once changed into one of the most poisonous snakes in the world and bit a villain he was fighting. He informed him that unless he turned himself in to the Titans, he would have no hope of getting an antidote.
In the recent Teen Titans, Eddie Bloomberg/Kid Devil/Red Devil's CMOA was when, after being made powerless for a time, he saved San Francisco from being blown up, sacrificing himself by flying the living nuclear bomb guy into space. His last words were "Titans Together." While the series has come under a lot of scorn for constantly killing off Titans (the issue's cover even lampshaded it darkly), it was a great conclusion to Eddie's character arc. Even when things were at their worst for Eddie and the team seemed to be falling apart, Eddie stuck with the Titans and called them family. This speaks measures of his loyalty to the Titans, which was sorely in need of being a family after One Year Later, and his dedication to being a hero.
In the first Titans series, the five founders are trapped in limbo by the Gargoyle. At first, it appears that they will have to reconcile whatever differences have been building up over the past few days and make nice, before Arsenal realizes that they are just going in circles. He points out that true friendship isn't solely about people being nice to each other, or praising everything they do, but it's also about pointing out when your friend is being a moron and giving them a necessary reality check. Roy states that he believes that all the years of the other four treating him like a screw-up and a jerk were what pushed him into becoming a better man. And it's because of that the five are able to truly defeat the Gargoyle and get back to reality.
Roy gets an early one when the Gargoyle traps the five into what appear to be versions of their childhood had certain events never occurred. While the other four Titans get a sense that something is wrong, Roy is the only one who knows right away that something is wrong when he asks his "father" if his mom will be waiting for them at home. When his dad is unable to give a clear answer, Roy states that while he remembers that his father had really died in a forest fire, he has nothing to go by on his mother. She was just never mentioned anywhere, so he only has a sense that he had a mother but nothing beyond that. And it was because the Gargoyle had nothing to work with in terms of the idea of Roy's mom that Roy immediately knew this wasn't right.
From Geoff Johns' run on title, we have the return of Dr. Light (Arthur Light) after the events of Identity Crisis. With his memories intact once more, he decides to get revenge on the Justice League by killing the current Teen Titans, a sort of payback for making him "[their] children's plaything." And, for the most part, he nearly succeeds, showing just how much of a threat he is now that he has his memory back and can use his powers to their full potential, going so far as to steal Superboy's heat vision and manipulate the lightning from Wonder Girl's lasso! Hell, he even overwhelms Raven's emotional vampiric ability by overloading it with the sheer volume of hatred he has for the Titans. And then, just when it looks like he's going to win and kill them all- plus Green Arrow- Nightwing shows up with the senior Titan members, including Flash and every single person who's ever been a Titan. What follows is one of the most epic beatdowns in the team's history.
Given that it's the first battle of the series, it's no surprise she gets one in "Divide and Conquer," punishing Cinderblock for underestimating her with a well placed boot to the head, all in her cheerfully character-defining way.
Starfire (cheerful voice): "I'm sorry to disappoint you... (eyes start burning green) but I am stronger than I look!"BAM!
The episode 'Haunted' provides a truly hardcore example of this trope. She, Cyborg, Raven and Beast Boy have been locked in the Tower's infirmary by a psychotic (albeit on an accidentally-inhaled hallucinogen) Robin, and though each is trying their best to batter through the walls and air ducts, nothing seems to be working. Raven, mentally linked to Robin, suddenly gasps out, "I can feel him...he's not going to make it!" Starfire looks horrified for a moment, then narrows her eyes and declares, "Then let us end this battle now!" as she swoops down, digs her nails into the inches-thick steel floor, and rips up a swathe of it like a can of beans.
Earlier in that episode she has a similar moment. Robin has just been confronted by his team, who are swearing that Slade—whom he thinks he's fighting—is not there. It reaches a peak when he snarls, "I have to stop him. I'm the only one who can. And I'll take down anyone who gets in my way!" Raven, Cyborg and Beast Boy stare at him in horror, but suddenly Robin is electrified by a flash of green. He yelps and topples forward... to reveal Starfire, her fist smoldering, having just shot not only her leader, but her love interest.
In the origin episode "Go," it is revealed that Starfire escaped to Earth while en route from Tamaran, having been taken as a slave/trophy by the Gordanians. Her captors are so afraid of her that she is locked in the securest cell they have... which she proceeds to break out of. She then beats the crap out of the entire crew, blows up the ship, and jets off to Earth. But it doesn't end there: terrified and in literally alien surroundings, she battles Robin, Cyborg and Beast Boy simultaneously, to the point of picking up a sedan with her foot and flinging it at Robin, while wearing handcuffs that prevent her from firing starbolts. There's a lot of other badassery from her in this episode—chief among them kissing Robin to learn English, then pushing him to ground and growling, "If you wish not to be destroyed, you will leave. Me. Alone." And she's the sweetest character on the show!
Defeating Blackfire (amped up with the power of the Jewel of Charta) in a brutal one-on-one battle for the crown of Tamaran.
Blackfire: You'll always be my little sister.
Starfire: I am not so little anymore!
The Cat Fight with Kitten and starbolting Fang in the face:
Starfire: Keep your legs off my boy!
A brief moment in "Betrayal", during the attack on the Tower: Starfire grabs a Sladebot by the arm, rips him apart, slams the remains into another robot, and continues to plow through at least three more, putting them all down in one hit. With her bare fists. In a matter of seconds.
Heck, her very first episode with Blackfire had one. After being the passively long-suffering victim throughout the episode, Starfire watches at the end as Blackfire cheerfully flies off to make her getaway, and Robin tries reassure her that Blackfire won't get away with it. Cue Starfire's clenched fists and glowing green eyes right before she launches into the air like a missile to chase down her sister...
Starfire: "No, she will not!"
The ensuing battle proves to be epically amazing, particularly the song playing in the background when Starfire flies through a storm of Blackfire's starbolts to reach her target, complete with Glowing Eyes of Doom. And when the starbolt hits Blackfire's hand, cut to Starfire rising up in front of her, poised to strike.
She instantly computed the number of molecules in a kilogram of oxygen.
Raven: "Nice flying, by the way." Starfire: *angrily* "At least I am able to fly! On my planet, even a newborn can unleash the unbridled joy of flight, but you are too busy being grumpy and mean to feel anything at all!"
In "Troq" Starfire gets repeatedly insulted and beilittled by supposed "hero" Val-Yor, who turns out to be a racist Jerk Asswho hates Tamarians, calling them "troqs", and Starfire still insists on putting the mission first and helping Val-Yor destroy the Locrex despite him being an Ungrateful Bastard towards her the whole time. Then when trying to destroy the core of the robot planet, Val-Yor gets trapped in a forcefield and looks to be doomed, until Starfire Breaks the forcefield and manages to save him in spite of him insisting there's nothing she can do for him, showing how truly selfless she is.
Starfire: "You may not value my life, but I still value yours!"
A subtler moment in 'Masks'. After Robin gets chewed out by the rest of the team for pretending to be a villain to try and trap Slade, fighting his team mates, not telling his team mates, the list goes on he's somberly looking at Slade's mask, knowing he deserved to be yelled at, but not looking very sorry. Starfire comes in, and he invites her to yell at him too. She doesn't, and simply asks him why. Robin explains, still justifying his actions. And maybe on purpose, maybe by accident, Starfire says one simple sentence that haunts the immovable Robin for seasons.
Robin: It doesn't matter. Slade figured it out, and I still haven't figured out anything about him.
Starfire: That is not true. Whoever Slade is, you and he are... similar. Slade did not trust you... and you did not trust us.
The fact that she doesn't use contractions and speaks rather emphatically can be a source of humor. It can also make her incredibly intimidating, such as her face-off with Robin in Apprentice pt. II.
In the episode "Betrayal," he holds his own quite well against Slade one-on-one. Slade had also regularly beaten Robin around in the previous season, despite Robin being shown several times to be the most competent fighter on the team.
The REAL crowning moment is the look of shock and fear in Slades eye as Beast Boy doesn't back down. He then procedes to demonstrate why Martial Arts masters don't go around challenging bears to hand-to-hand combat.
When after The Brain finished gloating and reciting his Speech Of Doom to the captured Robin, it cut to Beast Boy surrounded by fallen robots, who growls, "Now try and follow me." and then proceeds to blow the remains to smithereens using his section of the T-Ship.
Taking out his anger at Terra on everything in his path in "Aftershock Part 2," starting with "a robot army and a giant Franken-thingy" and ending with Slade when his anger is redirected toward him for taking physical control of Terra.
During the fifth season, Beast Boy is taking on the Brain's right hand ape, Monsieur Mallah, while also using the form of an ape. After getting knocked around and insulted for a while, Beast Boy turns into a triceratops and knocks Mallah out cold, even saying something to the effect of "Now who's dumb?"
"The Beast Within."
Because even when he's going crazy and out of control and is doubted by his team, Beast Boy remains a hero who WILL NOT let someone get away with attacking his friends.
And in that same episode, he made Robin (yes the very person trained by Batman) flinch.
Even later in the episode, Robin was seemingly about to KO Beast Boy while in his "beast" form. Before throwing a KO disk, Robin pronounces "Sleep Tight". Guess who ends up being the one to "sleep tight".
A case of Jerkass Has a Point, because despite how wrong he was to treat his teammates the way he did, he was right in calling Raven out on how much she picks on him and insults him.
In "Calling All Titans", one second, he's screaming at the sight of Cardiac, and the next, Beast Boy glares and launches himself at the thing.
Every single second of "Titans Together." Arguably one of the best episodes of the series.
Becoming 'The Beast' when Slade comes for Raven in "The End"
Using his lack of Shapeshifter Baggage as an attack against Trigon. He does this by flying inside Trigon's ear as a hummingbird, then immediately transforming into a whale.
Made even more awesome when you consider that earlier in that episode Beast Boy says jokingly (or at least the audience assumes so) he'll use his "patent wet willy maneuver" on Trigon. And then he actually does it.
And makes Trigon cry in pain. Trigon is so powerful that his very presence transformed Earth in an hellish world, and Beast Boy made him suffer so hard he cries.
After several seasons of Beast Boy wanting a moped, he finally rides one in style in Employee Of The Month.
In Revolution, when Mad Mod captures the Titans, he remarks on the absence of Beast Boy, only for him to land from the sky as a flying squirrel, crawling all around Mod and tickling him into letting go of the cane.
Beast Boy turning into an alien dog in "Betrothed."
Cyborg: How did you know you could do that?
Beast Boy: Lucky guess!
In the episode "Wavelength", the entire team is deep underwater and the T-Ship gets destroyed by a mind controlled squid. Beast Boy turns into a whale and catches everyone in his mouth. Although it's downplayed for being "gross", he essentially saved his teammates from drowning while being pursued by aforementioned squid and taking it out by working together with Aqualad.
Homecoming Part II, he's fighting Monsieur Mallah, a super-intelligent gorilla. First he tries by turning into another gorilla and gets out-smarted. Mallah taunts him...and Beast Boy shuts him up by turning into a triceratops.
Slade is the unfortunate victim of Raven's truly brutal CMOA (though after the things he did to her before, he certainly deserves it). After Slade tells the other captured Titans, "This won't hurt a bit," Raven announces herself with a Bad Ass "Wanna bet?", bowls him over like a speeding train, cuts off his escape with an icy, "I'm not finished yet," telekinetically reaches into the ground, pulls Slade back up, tells him, "This time, I have a message for you...", and then mercilessly flings him about the room like a ragdoll, crushes him in all of the rubble she's made beating the living crap out of him, and then sends him running back to Trigon with his tail between his legs. Good thing he's already dead, because he definitely would have been after that.
In "The End Part One" even while Raven has accepted her fate and the end of the world, she still manages to take out some of her anger on Slade as he escorts her to the chamber in which she is destined to summon Trigon to Earth. She speaks to him, with a kind of bitterness you don't ordinarily see in Raven, and demonstrates that his own army shows more obedience to her than him. And her demon mode is on during this whole exchange, amplifying the sheer kickassery.
Raven: You're a fool. Whatever he promised you, he won't deliver.
Slade: Dear child, you don't know what you're talking about.
Raven: You think I don't know my own father?
Slade: You are merely the portal. An insignificant pawn in Trigon's game.
Raven: Then I guess we have that in common. And once he gets what he wants... you'll be insignificant, too.
Slade: Shut your mouth! (His minions grab him) Get off me! Do as I command!
Raven: Come to think of it, Slade, you're already insignificant. Even your own army won't listen to you.
Raven denouncing Trigon as her father in "The End Part Three". And then proceeding to totally own him.
You may have created me, but you were never my father. Fathers are kind. Fathers protect you. Fathers raise you. I was protected by the monks of Azarath. I was raised by my friends. They are my family, this is my home, and youare not welcome here! Azarath Metrion ZINTHOS!
In Season 1's "Nevermore," Raven loses her temper after being taunted and tossed around by Dr. Light. She commands him, "Don't come any closer." After another taunt from the good doctor, she lets her demonic side loose, towering over Dr. Light and dragging him toward her with writhing tentacles of shadow. She pulls him into her cloak, despite his cries of surrender, and when he emerges a moment later, his suit is ripped up and he's mumbling about the traumatizing darkness. Creepy? Yes. Moral Dissonance? Possibly. Awesome? Intensely.
Raven: What's the matter? Afraid of the dark?
This is even given a Continuity Nod in a later episode - when Dr. Light fights the Titans again, all Raven has to do is show up in front of him with tentacles and say "Remember me?" to get him to beg to be taken to prison.
However, in his next appearance after that, the good doctor displays no lingering fear of Raven at all, and casually blasts her when she tries the same trick of intimidating him. So, that implies that he somehow got over his trauma... which, when you think about it, is a moment of awesome for Dr. Light.
In "Nevermore," she fuses with all her personality sides to become a white-clad giantess and takes out the demonic version of her own anger rampaging in her mind.
What Malchior did to Raven in Spellbound was absolutelyawful; I think we're all agreed on that. Which is what makes Raven's comeback in the climactic battle of that episode even more awesome than it already would have been to begin with. I wonder if Malchior ever realized that in giving her the tool to let him out, he also gave her the power to put him right back where he came from. Cue the Ironic Hell for Malchior.
In Switched, when Raven and Starfire are, well, switched, Raven can't use Starfire's powers because they're linked to powerful emotions Raven usually represses. The starbolts, for example, are powered by "righteous fury". Even during the finale battle with Puppet King, she can't get them to work. And then he tries to destroy the puppets containing the spirits of the other Titans. Blam.
Defeating Slade in the first season finale by using his Arch-Enemy's greatest weakness — his obsession with himself: "New deal, Slade — I lose my friends, and you lose your apprentice. And I know how you hate to lose."
To clarify, the only reason Slade had any say over what he could do was because he had infected the other Titans with nanites that would eat them from the inside out. If Robin didn't do what Slade wanted, he would activate the nanites until he complied. To get around this, Robin infected himself with the same nanites to force Slade to back off for good.
Double dose of awesome in this moment: How does Robin know that Slade hates losing? Because he hates to lose too. He beats Slade by finally acknowledging how similar they are, something he's been trying very hard to deny.
In "Apprentice pt. I" when the whole team is surrounded by dozens of bad guys and he takes down ALL of them, not even giving the other Titans a chance to fight.
Slade: Who knows... I could become like a father to you.
Robin: I already have a father. (cue bats and Batman music)
Robin pulling out a sword in "The End Part Two" and using it to thoroughly slice up Trigon's flame demon minions. Awesome.
In "Masks," Robin emerges from the opening of a tunnel cut into the side of a cliff, jumps off said cliff, fires off a grapple line to rescue Starfire (who's unconscious and falling beneath him), twists around in midair and then sends another grapple line to snag the Sladebot flying ABOVE him (trying to escape with a stolen disk).
The lengths to which he goes for Starfire in "Betrothed" are pretty impressive. Highlights include climbing up to her top story balcony by scaling the wall with bird-a-rangs and later fighting off dozens of armed Tamaranian gaurds in the way of his timely interruption of her wedding.
In Haunted, Robin, just inches from dying, finally figuring out how to defeat his hallucination of Slade after an entire episode of being on the receiving end of one of the show's most brutal beatdowns. And with a Bond One-Liner as well!
"Lights out, Slade."
In X, when X breaks into a vault while leaving Robin in a room with a laser cannon with its sights aimed on him, Robin tears off the cannon from its mount and uses it to break down the vault.
Speaking of X, when Robin was the Red X as part of a ploy to get Slade, he fights the other Titans a couple times as part of it, and he absolutely curbstomps all of them both times, and unlike the last time he went up against the Titans as Slade's apprentice, they weren't holding back.
Robin calling out Cyborg for quitting his team to join Titans East:
Robin: So this is my fault?
Cyborg: It's not ABOUT you!
Robin: No! It's all about YOU! Because that's all YOU care about! You talk about being a man, but if you can turn your back on us after everything we've been through, you're nothing but a spoiled child!
Robin giving Terra one last chance in Aftershock to redeem herself leads to this awesome line:
Terra: I don't need you to save me!
Robin: You can only save yourself.
Hell, the fact that he is giving her a last chance is awesome. Terra had just seemingly killed Starfire, the girl Robin loved. And yet Robin doesn't lose control of his emotions or sacrifice his honor, he keeps the promise he made to Beast Boy to make one final attempt to bring Terra back to the side of good. Now that is a hero.
Rescuing young Raven from what was more-or-less Hell easily qualifies, and proves his worth as a leader as he encourages her to face down Trigon.
A subtle, but impressive one in The Quest. As part of the titular quest, Robin has to fight a monkey while balancing atop a bamboo forest. Robin casually strolls out across the slender tips of the bamboo as if he were walking down the street. Barefoot.
In Mad Mod, after an entire episode of the whole team being mindfucked by the titular villain, Robin realizes he has them all trapped in an enormous house of smoke and mirrors. He then jumps into a hole made into the side of the wall during the final battle, destroying the circuitry and shattering the illusion just as his teammates are captured again.
Cyborg gets a pretty awesome moment in "The End Part One," when he leaps in front of Slade and a horde of flame demons trying to storm the Tower, declares that "No one's getting in here!", punches a button in his arm and turns himself into a freaking tank with huge versions of his sonic cannon on both arms. And then blasts away at the whole swarm. It doesn't do a thing to slow Slade down but it was a worthy effort anyway.
The end of the episode Only Human. That was when he proved to himself that 100% was a just a suggestion.
To further explain this, he's fighting the powerhouse robot Atlas, who in an arm lock gets him to his max and then beats him, sending off Cyborg in shame. It takes an inner conflict with his mechanical limitations and his human determination, but our boy goes back for a rematch. During the fight they end up in that same arm lock, and he's again at 100%. But this time through Heroic Will, he pushes forward until his reader is at 110% before the screen cracks and goes all the way to 160%, and he emerges victorious. He even goes to turn a previous insult into a Badass Boast.
His first confrontation with Brother Blood, which involved fake defection and sacrificing the chance to be fully human again.
The best part of which is this moment: "Sorry. I got new friends.... PSYCH!"
His Final Battle with Brother Blood, when they both realize that it's not a mechanical brain but just a badass strength of spirit that allows Cyborg to resist his Mind Control.
And then he proceeds to hack into Blood's mind, hijack his Psychic Powers, and reconstruct himself by tearing apart the Cyborg-Copy robots that had been surrounding him.
"Cyborg The Barbarian" - killing hordes of green slimy bug-things with his sonic cannon is standard procedure. Killing the same amount with a goddamn sword thus being a Badass Normal is what makes this a moment of awesome.
In the same episode, Cyborg grabs an incoming sword attack between his palms and snaps it in half. Note that this is with one his hands heavily crippled and exposed to the air, thus making this at least a partialBarehanded Blade Block.
Cyborg's Curb-Stomp Battle against Adonis in "Overdrive", with the new Max-7 chip installed in his head, he beats Adonis so fast the other titans don't get a chance to land a single hit!
When she makes her Heel-Face Turn in "Aftershock Part 2," declares to Slade "YOU CAN'T CONTROL ME ANYMORE!", and proceeds to blast him into a freaking volcano, which actually kills him... for a while at least.
Her sacrifice at the end of Aftershock Part 2 using all of her powers to stop the volcano from destroying the city, complete with Crowning Music of Awesome too.
That scene in Aftershock Part 1 where Terra has a short one on one fight with Robin. At one point he grabs her arms from behind and slams her into a nearby fence. Proving she's no pushover, Terra immediately turns the tables on him, grabs his arms and slams him into the fence.
"Aftershock Part 2" begins with a moment of awesome for Terra's voice actress, Ashley Johnson in the form of a monologue listing all the terrible things Terra's done and how she has no regrets. With little to no help from the character's expressions, the voice actress delivers her lines in a tone that could be either apathy or hopelessness. Which, given the situation, was absolutely perfect.
Ashley Johnson also deserves a mention for her excellent performance in Aftershock Part 2 because the Never Say "Die" rule is in full effect, making a majority of her dialogue with Beast Boy narmy, but she pulls off an awesome delivery despite hackneyed wording that feels awkward when it's spoken out loud.
Also, her "surfing on rocks" performance in "Titans Rising," even if she was just doing,it to show off, it looked so awesome!
Her introduction was one. We have the standard "Giant monster chasing girl", Titans here to save the day! And then suddenly an earthquake, and it's revealed that it was all a trap and she drops a rock bridge onto the monster.
Robin and Slade during their Enemy Mine moment in the Teen Titans season four finale, where they took down dozens of demons in perfect sync, showcasing their eerie similarities. They even have the same boot prints.
In the episode "Birthmark," Cyborg rips a huge metal pillar off the wall and swings it at Slade. Slade burns through it
Slade: "Whoa"? That's it? No clever comment? I was looking forward to that.
In "The End Part 3," where he travels to the Underworld to get his body and soul back from Trigon. Perhaps the best bit comes from his confrontation with Trigon's giant demonic guard, who tells Slade that he "cannot hope to defeat pure evil!" Slade's response? "Actually, I'm not such a nice guy myself." He then proceeds to activate a bomb that blows the guard to smithereens.
The bit immediately afterward, where Slade takes his soul, as well as the guard's giant flaming ax, and just before leaving, pauses to toss the guard's severed head a Bond One-Liner: "Don't get up. I'll let myself out."
Later in the same episode, Slade gets to confront Trigon himself and tell him off.
In "X", Red X essentially invites Robin to chase him through an obstacle course full of laser triplines or whatever. He does it backwards, without looking, and dodges every single one. While Robin is chasing him. And Robin still doesn't manage to catch him.
Red X himself is essentially a Crowning Character of Awesome.
The other four Titans' Big Damn Heroes moment in "Apprentice Part 2", starting with Starfire announcing their presence by blasting Slade with a starbolt and made even more awesome by the accompanying dialogue:
Robin: Get out of here! Go! You don't know what those beams did to-
Beast Boy: Dude.
Raven: We know.
Cyborg: And we don't care.
Starfire: We are your friends Robin. We are not leaving without you.
When Slade deactivates the probes just before the Titans die, he is furious at Robin and he tries to kick him while he is down. To his surprise, Robin catches the attack and knocks him back. Knocked off balance, he is then attacked by the full force of the Teen Titans. First, Beast Boy becomes a tiger and slashes him brutally, Cyborg and Starfire blast him with full force, Raven psychic grabs him by the feet and slams him to the ground, and Robin finishes the job with a mean kick that destroys half of his mask.. Slade covers his face and retreats in true fear for the first time in the series.
Come on, how about Round 2 with Terra? They win.
Win? They completely thrashed her, which she herself used to describe the beatdown she got. It just shows you don't mess with the Titans, especially all five at once, AND when they're pissed off.
The entire final battle in the second-to-last episode "Titans Together" was one big CMOA for everyone...
Specifically, when Beast Boy rallies together the remaining four Titans and crashes The Brotherhood of Evil's headquarters and proceeds to challenge all the villains from every episode (except for Slade and Brother Blood)... after having seen that nearly all the other Titans are frozen. And then, when the "presumed dead" Titans also come crashing in.
Cyborg: Lesson number one: Never throw me down a hole unless you make sure I stay there!
Starfire: The lesson two: We never give up!
Raven: Lesson three: Your secret lair isn't very secret.
Beast Boy: Titans, together!
As for the “honorary” Titans:
Gnarrk using Kole's ice form to smash Ding Dong Daddy's car.
Bushido slicing through Atlas's leg.
Mas y Menos taking down and freezing Prof. Chang and his henchmen
Panthra doing an old-fashion lucha match with Wrestling Star and taking his mask “as per wrestling code.”
Herald taking down Malchior by sending him to another dimension.
Bobby facing down Monsieur Mallah, who had just previously swatted away Cyborg and Gnarrk with ease. What makes it even better is that Raven told the kids to stay away from anyone older then them and they end up fighting one of the most powerful villains there.
Kilowatt absorbing Overload
Aqualad and Tramm washing away Gen. Immortus and his army.
Jinx's betrayal and taking down both the rest of the HIVE FIVE and Madam Rouge with Hot Spot and Wildebeast.
Thunder's epic flip and releasing a shockwave that knocked over Warp and Trident
Argent taking down Johnny Rancid
Redstar beating the crap out of Steamroller
Speedy defeating Fang
...And many more.
After the big battle (a very, very well done one by the by) we cut to Dr. Light robbing a bank. The camera turns around to the five members, watching him rob the bank. Cyborg says, "Maybe we ought to show him who he's up against." and the camera tilts upward to show ALL THE OTHER TITANS.
Robin: Titans, GO!
It's a comedy episode, and it's a Crowning Moment of Funny episode at that, but the Action Prologue in "Employee of the Month" might be the single best one in the entire series. The panning, zooming effect as the farmhouse couple's revealed to be Robin and Starfire in disguise, the music that starts playing as Cyborg leaps out of the fake cow with a "moo yeah" to ambush the flying saucer and continues through the scene, the shapeshifting animation effect where Beast Boy changes from a pig to a hovering, diamond form and then expands out into a T-rex, the team's aerial pursuit of the saucer... it's odd that such an epic battle sequence is the cold open to a comedy episode, but it truly is epic.
Titan East passes Control Freak's challenges with style in For Real.
In "Betrayal", the tower is invaded by Slade's robot army. The defenses are down, the security system is locked, the Titans are a man down and facing literally fifty-to-one odds. And it's the middle of the night.
Starfire: They are too numerous to fight! What shall we do?
Robin: Fight anyway.
And they win. By the end of it they're exhausted, emotionally drained, and the tower is a wreck. But they win.
The Titans giving Billy Numerous a taste of his own medicine in "Over Drive" by multiplying themselves tenfold to combat all of the Numerous clones, highlights Robin using his baton to take out dozens of clones at once, Raven sealing a bunch of clones in large forcefield, Beast Boy taunting the clones and then chasing them off in a tiger form, and they completely exhaust Billy and cause his clones to dissapear, it's made even more awesome when it's revealed that the Titan "clones" were actually holograms created by Cyborg.
"Calling All Titans" in itself is a crowning moment of awesome for the villains. They came down en masse against the Titans, with one or two (some of the pairings also rather strategically clever as expected with the Big Brain being The Chessmaster) going up against a hero. Of the maybe dozens of Titans fighting, only four won their initial fights. For the first time in the series, the bad guys won. In a mass Curb-Stomp Battle, no less.
For Mumbo, the entire musical number in "Bunny Raven", particularly the ending. It manages to take a goofy and fairly harmless villain, and make him genuinely scary.
Jinx vs. Madame Rouge, both times. That Madame Rouge is a good deal stronger than her counterpart in the comics makes it that much more awesome, since Jinx clearly isn't expending any real effort and still comes out on top (granted, she wasn't doing the actual fighting the second time, but still...). Special mention must also go to her Heel-Face Turn in "Titans Together", where she wipes out her former villain team with a single finger-snap (which creates a giant energy wave to hit them).
Kid Flash's fights against the H.I.V.E. F.I.V.E. and his showdown with Madame Rogue.
What fight against the H.I.V.E. F.I.V.E.? He toyed with them, and the only reason it was not a Curb-Stomp Battle in his favour was that he was too busy making them look stupid and flirting with Jinx to fight back.
Did we mention Madame Rouge? Every battle with her is filled with awesome moments. The two episodes that featured her as sole villain show her as being on a level of Badass just short of Slade. She even gets to T-1000 her way through a fence. And she can stretch fast enough to beat Kid Flash as he as moving at superspeed! An episode with her is in fact quite like one with the Terminator: the heroes spend most of the time on the defensive against an opponent that just. Won't. Stop.
Brother Blood definitely gets his share. When his cyborg copies invade Teen Titans Tower East,the alarm systems are shut off so he's free to enter through the window into the main living area where Cyborg is. He then pulls off a Slow walk across the pool and proceeds to block all of Cyborg's blows and cut through to his heart/power generator with only two fingers!!!
Just to be clear, he blocks punches that have taken out extremely powerful baddies with only two fingers. And we all know how strong Cy is.
Honestly, Blood is pretty much a walking CMOA whenever he busts out his full powers- another example would be his final battle with Cyborg, where he tears his opponent literally to pieces with his bare hands while simultaneously holding the rest of the core team and Titans East immobile with his telekinesis. He's probably tied with Slade and Madame Rouge for being the most physically dangerous villain.
Let's not forget Mad Mod. He manages to first capture the Titans in a fairly obvious way (by pumping knock-out gas into their tower), then proceeds to screw with their heads in a funhouse of Op Art illusions, Hypnoscreens and equally awesome Pop Culture references. He does all this despite being a fairly old man.
In Revolution, Mod manages to hypnotise the population of the city, replace the whole city with newspaper cut-outs of British buildings, replaces the sky with the goddamn Union Jack, creates nigh-invulnerable robots and has the gall to attempt striking Robin with his cane. He does this to trap Robin and transfer his youth into himself. Yes, that's right, an old British guy manages to attack and steal the youth out of the Boy Wonder.
No love for Pantha? In Calling All Titans it seems as though she's doomed at the hands of Atlas and Adonis. In Titans Together? We get this:
Pantha: This Brain. He sent the wrong opponents to try and capture me. Pantha remains UNDEFEATED!
Aqualad is generally only known for breathing underwater, control over water in general, and communicating with aquatic life. However, in Titans East, Part 1, while he did fight an army of Cyborg-copies with water attacks, he did manage at one point to tear off one of their arms, then tear them apart with that same arm. In addition, with one punch in the right place, he made one explode. All that takes some serious strength.
In "Wavelength" he also demonstrates his super strength by punching his way through the Titans front door (a solid steel door, mind you) and then collapses a massive rock outcropping with a single punch.
How about in Hide And Seek when the kids, who had up until that point mostly played The Load, get captured by Mallah, but when he overpowers Raven, their innate superpowers kick in and they begin fighting back a super-intelligent, talking gorilla. Special mention goes to Melvin, and her awesome line, "Hey, you big ape! Why don't you Pick on Someone Your Own Size! Bobby, get him!"
Also, Bobby was real! If Melvin can imagine a gigantic, ass-kicking, oddly cute bear, at that age, imagine what she'll be capable of in the future!
What about Control Freak in "For Real"? If the original Titans had been home, those gadgets might very well have worked!
And he almost defeats the Titans East with similar traps. The guy is probably the ultimate example of Dangerously Genre Savvy.