Green Arrow has shades of this in later episodes of Justice League Unlimited. In To Another Shore, he gets trapped in ice and we next see him getting out with (Waiiiit for it...) an arrow with a buzz saw on the head.
Green Arrow: And Black Canary said a Buzz-Saw Arrow was self-indulgent...
Parodied in the "Bart Gets An Elephant" episode of The Simpsons: when a peanut factory foreman spots the title elephant approaching, he gives the following dramatic announcement:
Foreman: This is the moment we feared, people! Many of you thought it would never happen. But I insisted we spend two hours every morning training for it. You all thought I was mad. Many of you requested to be transferred to another peanut factory. But now we... (the elephant bursts through the door and crushes the foreman)
In an episode that marked the beginning of An Arc in ReBoot, "Nullzilla," Phong just happened to have a plan to deal with an out-of-control Godzilla-sized villain/Null amalgamation-thing running amok. It involved Humongous Mecha and an extended parody of both Sentai and Thunderbirds. This was appropriately lampshaded.
Dot: Well, we know physical force can't hurt nulls. We'll have to try containment. Phong: Do not worry. I have prepared something for just such an emergency. Bob: You're prepared for a giant monster made entirely of nulls STOMPING AROUND MAINFRAME? Phong: That is correct! Bob: How do you plan for that? Phong: Ah, lucky guess?
Later in the episode, Phong tells them to finish the monster with a weapon, but realizes that it's still in its glass case. The case reads "IN CASE OF GIANT NULL MONSTER THREATENING CITY — BREAK GLASS"
In the Kim Possible episode "Rufus versus Commodore Puddles", Drakken attacks Area 51 with his dog, grown to 50 feet in height. The General in charge is perfectly calm and rattles off a plan number to deal with an attack by giant canine; the plan involved Howitzer-sized truck-mounted dog whistles, and stealth bombers loaded with giant milk bones, all of which were apparently pre-loaded in the hangars. Later after Rufus has dosed himself with the same rays (like you didn't see this coming), he rattles off another plan to cooperate with an enormous burrowing rodent.
The amount of gadgets our characters have also falls into this on occasion:
Mr. Dr. P: "You wore rocket skates to graduation?"
Ron: " Yeah, you never know..."
This doubles as a Continuity Nod as Ron was caught without them at the start of the previous finale.
In an episode of The Fairly OddParents, Timmy, Cosmo and Wanda need to be rapidly transported to Texas. As they use a conveniently-located escape pod to Texas in Timmy's bedroom, Cosmo smugly says to Wanda "And you said the escape pod to Texas was a bad idea!" She also said the second escape pod from Texas was a bad idea.
In "Escape from Unwish Island", the villians related to Timmy's previous wishes escape from an island (made specifically due to Timmy's constant unwishing) to kidnap his parents and friends. And how do Timmy and his godparents get there to save them? A conviently wished escape pod TO said island (which also was a "bad idea" in Wanda's eyes). ... however, this was wished up BEFORE Timmy found out about said island...
Foghorn Leghorn after a Non Fatal Explosion: "Fortunately, I keep my feathers numbered for just such an emergency." (He used that gag in two episodes, actually.) He has also been known to carry around "a spare suit" of feathers, that he slips on like a giant onesie.
Another Looney Tunes cartoon - this one involving Pepe Le Pew - ends with him and Penelope falling off a cliff. Penelope clings to him in terror, clearly believing they're falling to their deaths, but fortunately, Pepe has a parachute. He turns to the viewers and says, "A true gentleman is always prepared" right before the screen fades to black.
Sheen: Gee, wish I had one of those air-freshener things you hang in a car. Carl:(holding some up) Lemon? Or strawberry? Sheen:(taking them) Thanks! Wait... why do you carry those around with you? Carl:(averting eyes) ... 'Cuz...
Cindy: "Quick, Carl, gimme that bag of Jimmy's hair you carry around."
Jimmy's watch, which has every plot-related device you could need squished into something about the size of six computer keys. This includes (but sure isn't limited to) freeze rays, lasers, magno-rays, GPS, tracking devices...you name it, there's probably a gadget for it in there.
In one episode, Coop is forced to choose between the "Crush Moth-like Bug" or "Anti Coccoon" buttons, neither of which are situations most people would expect, let alone design commands for. A fair bit of this comes from his Context Sensitive Buttons, actually, but that's just one of the most apparent.
If it involves widespread destruction, Coop has a button for it. Possibly more than one.
In one episode, his first tactic is to push the buttons marked "missiles", "more missiles" and "all the missiles". Later in the episode, he fires -you guessed it- missiles.
Lampshaded in Hoodwinked where the Mountain Goat constantly brags about how he's prepared for whatever may come. He even sings a song about the importance of it all (Be prepared, be prepared, this lesson must be shared...) Granny counts too, since she carried "a bit of this, a bit of that, a bit haz-mat"...
And then subverted with Japeth the Goat.
Ooooooh, an avalanche is comin', and I do not feel prepared,
It's rumblin' like a mountain lion - I must say that I'm scared,
And if not for the witch's spell, you'd hear just how I scream,
WordGirl and Captain Huggyface apparently have a plan for everything, and WordGirl only has to shout "Huggy! Plan ###" and they put it in action... in theory. But, half the time, Huggy can't remember what she wants to do at all (and she has to say something like "You know, the one with the trampoline...?") and often the Narrator will question her about why she felt the need to plan for something so unlikely.
This was subverted in, "A Simple Plan," when she didn't have a formed plan to escape a metal cage. When you look at other plans (like, "Have Huggy eat the statue made of meat") this seems crazy. Instead, she rattled off parts of other plans — "How about the first part of 344? Or you could do 66 backwards with a little bit of 12 thrown in..."
Where the Fenton Works is prepared from head to toe with both offense and defensive weapons and shields to protect/do ungodly harm towards anything ghost-related; either small or a large scale invasion. It's utilized several times and at one point, used against the Guys in White.
Danny and his mother are headed to a mother-son science symposium and she turns out to have camping gear as well as a vast array of ghost-hunting equipment on her (despite wearing a skintight jumpsuit)... but no mobile phone. Lampshaded by Danny: "How can she not have a phone in there?"
To keep Nermal from feeding his guppy refrigerator food, Garfield weaves a tale of giant radioactive mutant guppies in the sewers. Despite the fact that Garfield told it as a lie, he has nevertheless stashed a barrel of tartar sauce in the garage in the event that they should make their way above ground and attack. The fact that he doesn't also have handy about 600 pieces of lemon or enough fries to go with them reduces not the scale of Crazy-Prepared-ness one whit.
In a "U.S Acres" episode, the characters (Orson Pig and Wade Duck) lampshaded this with a restaurant that can make anything with a "How to Cook Anything Cookbook". Their customer (Who happens to be Roy Rooster), in an attempt to make Orson and Wade give him free food for a month (due to their slogan), asks for an elephant foot sandwich with mustard. However, neither didn't want to harm an elephant they found, so as a joke to make it work it they brought it back:
Roy: So you couldn't find an elephant?
Orson: We got plenty of elephant... (Roy is shocked as he sees the elephant) ...we just ran out of mustard.
In Storm Hawks, Stork, due to his paranoia, has the Condor armed with a myriad of traps. Although his crew mates complain, these preparations eventually do prove to be useful, allowing him to gloat.
Slade lives this trope on Teen Titans. He always seems to have a backup plan and an escape plan (if he appears in person at all). He's very fond of using robotic duplicates of himself to mislead the heroes. He always seems to be one step ahead of the the Titans, and even when they foiled his plans, they were usually only helping a much bigger one succeed.
On the other hand, Slade isn't perfect. His Evil Plans of both seasons one and two involved gaining an apprentice, and both failed miserably due to factors he was not prepared for, the second time with consequenses that would have been lethal for him if he hadn't "gotten lucky" as he put it.
On the third hand, Slade proved he fit this trope again in season four after his Deal with the Devil didn't work out as he planned. Trigon did not keep his word, but fortunately for Slade, he considered that possibility, and wore a magical ring that protected him from Trigon's attempt to kill him. Later, he formed an uneasy alliance with Robin in order to take what he was promised by force, and succeeded.
In Animaniacs Wakko has a gagbag which contains anything that the situation calls for including a refrigerator filled with food, a working toilet and an endless supply of weapons.
In an episode of Scooby-Doo (as in the original 60s/70s cartoons), Daphne, Velma, and Freddy are captured and locked on a wall chain by ghost pirates. At this time, Freddy just happened to have gum and a bunch of straws to reach a key on the other side of the room/cave.
Megatron, in any of the many Transformers incarnations, where he proves to be a cunning schemer whose steel trap mind conceives and implements plan upon counterplan upon contingency plan. So the original Megatron got trapped in Earth's prehistoric past for millions of years, locked in the perpetually frozen remains of a failed assault on the Autobots? No problems! He had already planted a message on the golden disk of the Earth deep space satellite Voyager, detailing the location of prehistoric Earth so that his future namesake could find Optimus Prime and attempt to murder him to alter the very course of history. Yes, he had planned for that eventuality!
Not exactly. The message was that Megatron knew transwarp tech was being developed that would enable time travel and that if the Decepticon cause failed, any remaining loyal Decepticons should use that tech to change history.
In the Beast Wars episode, "Double Jeopardy," Megatron is deposed by Terrorsaur and locked in a prison cell. Once out of sight of the other Predacons, Megatron simply orders the computer to open the cell door.
"The wise tyrant always ensures his prisons are designed for his personal escape."
Carl had robot duplicates of the Flynn-Fletcher family on hand "in case of emergency". Even Major Monogram is weirded out by it.
When Perry got a job as a truck driver, his new boss was happy because he had recently written a song about a truck driving platypus.
"Luckily I picked today to wear my bike helmet in the shower."
There was an episode of SpongeBob SquarePants where Spongebob and Patrick are wearing anti-searhinoceres undergarments. Considering they aren't expecting a seabear appearing (which is what sets off searhinocereses) and they were only several feet from their house, they were really prepared.
In one episode, Spongebob tries to win Employee of the Month by getting to work earlier than Squidward, so he breaks Squidward's alarm clock. Squidward reveals a closet full of alarm clocks.
The Magic School Bus: Ms. Frizzle. First off, she has a bus (magical) that can turn into anything she needs it to, various random ray guns that do... well, whatever she needs a ray gun for (shrinking, growing, etc.), plans for various field trips — and, hey, if they happen to teach her kids at the same time, there is no problem with that! Her house, and all of her dresses that just happen to have the proper pattern for that day's lesson plan. Well, unless she only has a few dresses that are like a chameleon, and change patterns to whatever she needs it to, but then WHY does she have them?
Perhaps so she can teach how they work?
In an episode of Sabrina: The Animated Series, the protagonists are trapped in a castle with a lot of vampires. They make a really loud noise to break all the windows, letting the sunlight in. The head vampire simply presses a button on his throne, and the suits of armor all cover the windows with their shields. Somebody goes, "You've got to be kidding me".
In an episode of Chip 'n Dale Rescue Rangers, Wrench Wench Gadget and another character are trapped in a glass tank. She pulls out a glass cutter bigger than she is and escapes, leading to the classic exchange:
Chip: Do you always carry a glass cutter around with you? Gadget: No, only when I need to cut glass.
This is something of Gadget's hat. In the Five-Episode Pilot she had an inflatable raft in her pocket large enough to carry the entire gang, and if she's not inventing exactly what she needs in a given moment right on the spot, she already has it ready just in case the situation ever came up.
In the 1956 Chip 'n Dale short "Chips Ahoy", Dale showed some uncharacteristic cunning. While trying to escape from Donald Duck, he cut Donald's sailboat's sail, drilled holes in his canoe, removed the screws from his rowboat, and tied his motorboat to the dock without Donald noticing.
Fishtronaut: The little fish agent wears a powerful suit with a lot of mystery-solving equipment. He should carry more rebreathers on them, though.
In one Warner Brothers cartoon, Daffy tries to bedevil Porky by demanding to know if Porky has a license to do various increasing ridiculous things, such as a license to sell hair tonic. To bald eagles. In Omaha, Nebraska. Porky has the appropriate license. Including a license to use Daffy Duck as a motor, to Daffy's great regret.
King of the Hill: Dale's overkill security system comes in handy when the guys need to protect an incriminating photo from a violent football player.
In one episode of Rocky and Bullwinkle, Boris Badenov whipped out cardboard cutouts of himself and Natasha.
Natasha: Darling, do you always carry cardboard cutouts with you?
Boris: ...Doesn't everybody?
In the 1972-73 cartoon version of Around the World in Eighty Days, Phineas Fogg has a bag that he fills at the start of each episode with all kinds of things that just happen to come in handy during the episode.
Fred Jones in Scooby-Doo! Mystery Incorporated. Not only has he set up traps in his house so it could be controled from his laptop computer, he somehow managed to set up traps at all his friends houses just in case of a ghost attack. He also had bait to trap a Manticore in a fridge in his room for just such an occasion. And when Daphne's parents ask him how he knew that the villain would step on a specific spot of their yacht and set off his trap, he reveals that he didn't know...so he covered the entire boat with traps. Cue Daphne's parents setting off a pair of the other traps. Whoops.
Pinkie Pie can set up a party at a moment's notice. In "Sweet and Elite", it's revealed that she owns a "party cannon" that can instantly blast a room full of decorations - and she never leaves home without it. According to "It's About Time", she has rubber balls and eyepatches hidden all over Ponyville (including one in Twilight Sparkle's kitchen fireplace) for emergency use. Both items come in handy; Twilight uses a ball to lure Cerberus back to Tartarus, then ends up wearing a patch after she accidentally looks at the sun through her telescope.
In the third season premiere, King Sombra was one of these before he was banished by the royal sisters. He hides the Crystal Heart (his primary weakness) on top of his castle where his earth pony subjects couldn't reach it, the only means of access being a through a passageway hidden by magic, on the other side of a cursed door that displays the worst nightmare of anyone who opens it. Both of these are impossible to get through without magic, which none of his subjects had. Then it turns out that even if one gets past those, the heart itself is warded against magic and teleportation anyway, and messing with it activates another spell that starts re-asserting his influence over the kingdom. To top it off, the entire city is under a spell of magically-induced depression, because the Crystal Heart is powered by happiness, and even if someone managed to get the thing out of Sombra's castle, they wouldn't be able to use it because everyone was too depressed to activate its power. What he wasn't counting on was a team of foreigners—some of whom did have magic.
Duck Dodgers carries exploding brownies and cheese danishes in his pockets.
In an episode of Super Friends, Lex Luthor and Darkseid team up. They manage to capture Superman, Wonder Woman, Firestorm, and El Dorado, then drain their powers into Luthor. Luthor suddenly declares that since he has all their powers, he's more powerful than Darkseid and will be taking over. Darkseid surrenders and Luthor sits in Darkseid's throne... which promptly sprays him with kryptonite dust, defeating him since he has Superman's powers.
In the G.I. Joe episode "Cold Slither", a guy tries to pull off Cobra Commander's mask, but it electrocutes him.
In the Ed, Edd n Eddy episode "X Marks the Ed", Rolf prepares what he calls "Carbuncle of the Flesh Stew" to rid Eddy of his giant pimple. When Rolf mentions that it has to simmer for 14 days and 14 nights, he shows that in cooking show fashion, he thought ahead and pre-made a batch.
Eddy's Brother also seemed to be prepared for The Movie: he had a fire alarm in his room labeled "In Case Of Movie Break Glass". It contains...
The peanut, seemingly a subversion, is actually a Double Subversion because it contained the key to the car in the room.
In one episode of The Powerpuff Girls, in response to Roach Coach attacking the city, Blossom flies off and comes back with a giant jar. In a much later episode, when the girls are dealing with a Methane Monster, Blossom flies off and comes back with a giant match. When asked where she got that, she says, "Same place I got the giant jar, silly. Season one, episode two. Remember?"
Young Justice Lex Luthor demonstrates this when the original Roy Harper tries to assassinate him.
His desk doubles as a bomb shelter. "That, my dear, is why I paid top dollar for a customized desk."
His bodyguard is a robot with a machine gun arm instead of flesh and blood.
After hearing about the original Roy's rescue he anticipated the exact nature of the boy's revenge blowing Luthor's arm off with his own technology because his own arm was cut off so The Light would have an endless supply of his DNA to perfect their cloning technique, and prepared a solution that would not only negate his anger but make him intensely grateful. It was a bionic and weaponized arm.
In The Little Drummer Boy, the ringmaster of a traveling circus, Ben Haramad, is looking for new talent for his circus and comes across the title character, Aaron. When his apprentice, Ali, points out that Aaron hates humans and wouldn't join the circus willingly, Ben Haramad shows him a rope. He certainly knows how to reel in his talent no matter the circumstances!
Ali: But it is said that Aaron detests all humans. He will not join us willingly. Ben Haramad: Oh? Why do you think we brought the rope?
Varrick from The Legend of Korra; he has an airplane onboard his speedboat just in case the boat sinks, managed to pull off a very good frame-up of Mako when his War for Fun and Profit scheme begins to unravel, had a very nice, well stocked prison cell built in the event that he gets sent to prison, bought a battleship just in case he needed one, and managed to escape prison using some kind of hang-glider.