Adaptation Expansion: Digimon Adventure was supposed to consist of just the 30-minute movie, but the producers decided to turn it into a television show too. And what great results came out of that!
Adults Are Useless: Subverted. The children are generally the only ones who can save the world, but the parents are actually relatively important too. The kids revere their parents and once in a while they can help a little too.
Adult Fear: A good deal of them come up, mainly in the Myotismon arc where the parents find out the danger their kids have gotten into.
Animation Bump: Episode 21 was directed by MamoruHosoda, who made the first two Digimon films. The quality of the artwork was considered by many to be a huge improvement, but Hosoda only directed one episode due to creative differences between his style and the style of the series as a whole. This episode is in some ways comparable to the Dark Ocean episode in Adventure 02, directed by ChiakiKonaka.
Attack! Attack... Retreat! Retreat!: Some of Piedmon's Vilemon army eagerly chase after some Gekomon in the final battle... then are seen being chased themselves by the bigger Digimon also taking part in the battle.
Apocalypse How: X-5 Apocalymon attempted to destroy both the digital and real worlds with an explosion which was contained by the Digivices.
Artistic Age: The Pilot Movie, set 4 years before the start of the series, featured a 7-year old Tai and a 4-year old Kari. Due to the drastic style difference (chubby bodies, very small hands and feet) both looked much younger. This wasn't helped by the fact that Kari was seen in a high chair and barely had any dialogue, being portrayed more like a toddler. It could be justified by the fact that the series hadn't established its characters yet, so Kari might have been intended to be a toddler in the movie before the show set her present age to 8, retroactively making her 4 in the film.
Big Bad Ensemble: Apocalymon created the Dark Masters, who attacked the Agents in an attempt to steal the Digieggs, tags, and crests. Gennai escaped with them to File Island but dropped Gatomon, who was later found by Myotismon, who had taken over the Agents' abandoned complex and turned it into his castle. Etemon took control over the Dark Network and used it to rule over the Server. Devimon took over File Island using the Black Gears and succeeded in stealing the tags and crests from Gennai and scattering them across Server.
Bittersweet Ending: The kids save both of the worlds from Apocalymon and the Digital World reformats so it can start over in peace with the absence of the evil Digimon, but they have to leave the Digital World and their Digimon friends behind, seemingly forever. Fortunately, the next show fixes this.
Central Theme: Each crest is governed by these. The most obscure are Knowledge (wisdom, curiosity, knowledge, critical thinking, awareness of and engagement in immediate surroundings, using the aforementioned to help others) and Light (the advancement of all that is good and right).
Myotismon is frequently one step ahead of the children, and even manages to overcome his own daytime weaknesses by plunging their home city into permanent fog.
Machinedramon, who uses Izzy's laptop connection to pinpoint his and Tai's location, and thus to direct his forces to them.
Clip Its Wings: Angewomon gets impaled on the wall by her wings, courtesy of Piedmon. Puppetization followed soon after.
Cold Open: The original version of the finale holds the title card until after Apocalymon's death. The dub's last two episodes premiered in America as a pair; Fox Kids bridged them by skipping the intro to the finale.
Conspicuous CG: Greymon and Garurumon's evolutions to Perfect level, as well as their warp-evolutions, use 3D animation. It looks... rather out of place, given that every other Digimon use traditional hand-drawn animation in their Perfect evolution sequences. This would later be repeated in Adventure 02, Tamers and Savers, with Paildramon/Imperialdramon, Guilmon and Terriermon's lines, and ShineGreymon and MirageGaogamon's Burst Modes respectively.
Dark Is Not Evil: Towards the end, Gennai makes a point about how Virus-attribute Digimon aren't necessarily evil. It's seen most prominently in the Gekomon and Otamamon and later Ogremon.
Dangerously Genre Savvy: Infermon in Our War Game, for tricking them into thinking he was just an Adult, then when they figured it out and tried to match him, averting Transformation Is a Free Action. Tai actually complains about the unfairness in the original. To top it all off, he RUNS OFF GIGGLING RIGHT AFTERWARDS, before the smoke even clears. That's right, he knew it worked even before Tai and Izzy could see the results. He just gets even more so from there. Now that he's aware they're keeping track of him through the internet? Disrupt the phone network to disable their ability to access the internet. They use a military satellite uplink to get around that? Stop fucking around and use that same uplink to hack the military and Nuke 'em. They're coming to kill you before the nuke hits? Multiply like hell and crush them with sheer numbers.
Apocalymon in the final battle was surprisingly cunning as well. He directly attacked the children, thus forcing the digimon to become human shields and leave themselves defenseless to his attacks. The kids in turn got Genre Savvy right back at him and rode on their Digimon for the second battle, rendering this tactic useless.
Angewomon has had this on two occasions. She cuts off her opponent midsentence during Calling Your Attacks by calling hers faster. In both cases it resulted in her victory.
Deadly Upgrade: When Greymon was pressured into evolving by Taichi, he changed into the dark SkullGreymon, a mindless monster. When it evolved "naturally", he became his true Perfect form, MetalGreymon.
Diabolus Ex Nihilo: Apocalymon. Absolutely no hint that he even existed until the last three episodes, then bam they're fighting him. This was partially induced by Executive Meddling; the plan was to have a proper lead-up to him and explain his connection to the Dark Masters.
Dinosaurs Are Dragons: The Agumon line, though none of the forms had the "dra" syllable that marks it having some aspect of dragons.
Ironically, WarGreymon, his Mega form, has a pair of claws called the Dramon Destroyers that are extremely effective at destroying Dramon.
Disaster Democracy: Taichi is voted leader at Vamdemon's castle, and slowly grows into this role.
Distress Ball: WarGreymon participates in every fight with the Dark Masters. He spends most of each fight firmly clenched between teeth, manipulated by an opponent, paralyzed by hunger or transmogrified into a key-chain. His allies have to rush to his rescue due to his rushing into fights, sometimes with a tragic outcome.
Surprisingly averted with the main children, though in a roundabout way. The dub kept their Japanese names intact, and the "English" names they use are simply nicknames. Tai and Kari's surname was changed from 'Yagami' to 'Kamiya', though that was due to a mistranslation, and was not a conscious decision.
But adverted in the spanish latinamerican dub where they are Tai Kamiya, Kari Kamiya, Joe Kido, Izzi Izumy, ans do on.
From the Movie we have.
Diablomon -> Diaboromon
Omegamon -> Omnimon
Justified Trope - Evolve was changed to Digivolve to avoid confusion with Pokemon.
Dub-Induced Plot Hole: Matt's father knowing who Gabumon was, during the Real World Arc, which lead to many speculations that Matt's dad was a Digidestined. There's also Mimi's throwaway comment about her little brother early on in the series, prior to the clarification that she's actually an only child. The important ones are corrected or ignored when the situation arises.
Dub Text: Matt and TK being half brothers. Hmm, no wonder the parents divorced and their mom kept TK. The dub later abandoned this and reverted them to being proper brothers.
But in the spanish latinamerican dub, they call one each other as bothers but they parents are divorces and keep TK, but call bother to your half bother in spanish is sign of faternity bethween bothers.
Elite Mooks: Snimon and Tuskmon. Snimon is able to take down Garudamon despite only being an adult level while Tuskmon throws Garurumon around like a ragdoll, forcing Kari to give herself up to Vamdemon. The second time they clash with three of the Chosen Children who engage the two as a distraction. WereGarurumon opens with a sucker punch to both Digimon, which they both shrug off. This time around, Garudamon handles Tuskmon on her own, leaving Zudomon and WereGarurumon to fight the more powerful Snimon. Even after being outnumbered by three Digimon each an evolution level higher, they still manage to keep the three Digimon and their children tied down long enough for the other children to climb to the top of the Fuji TV Station before they are incapacitated.
Everything is Online: Justified in that the Digital World arises from the Earth's various communications systems, so Digimon could theoretically affect all electronic systems (the Pilot Movie shows strong interference with electronics whenever a Digimon evolves or emerges). On the other hand, there's Our War Game. Diablomon was explicitly stated to exist on the Internet... so what are Ferris wheels, nuclear missiles, and supermarket scanners doing hooked up to the Internet? In 2000?!
Evil Brit: Ther only character to speak with a non-American accent is the Big Bad of the fourth arc, Piedmon, who appears to spend most of his time doing a whimsical Tim Curry impression.
Evil vs. Evil: MetalEtemon vs. Puppetmon in the Dark Masters Arc. Probably not the only time, but notable in that it's the only time two Big Bads fought each other.
Fake Kill Scare: When Kari surrenders to Myotismon, he asks the already-captured Gatomon if she really is the eighth DigiDestined so he can kill her. Being Kari's partner, Gatomon tries to protect Kari by pretending she's never met her before. With a snap of Myotismon's fingers, Kari screams and Gatomon blurts out her name in horror, only to find DemiDevimon was just tugging on Kari's hair.
Family-Friendly Firearms: In the dub, Pinocchimon/Puppetmon's gun is removed. This goes so far that when he reaches for bullets to reload, the shot cuts off and he says (from offscreen) that he's itching his legs.
Foreshadowing: In the episode "Evil Shows His Face" the kids walk into a mansion and TK comments on the beauty of an angel painting. Patamon asks what an angel is, which TK then explains. Guess who later evolves into an angel. This also references something explained in expanded universe materials about Devimon - he's a fallen Angemon.
Also in "Evil Shows His Face" there are 8 beds but only 7 children ... at the time.
Subversion. Word of God said Hikari was not originally planned to join the group, so the 8 beds was likely just for coordination.
In Episode 2, "Garurumon", when they encounter the trolley car Tai suggests that it might be their way home.
Once the Digital World appears in the sky, there are reaction shots from New York City, Paris, and Moscow. Each city is featured in an episode of the Digimon World Tour.
Fur Against Fang: WereGarurumon vs. Myotismon in episode 33. Notably, WereGarurumon was shown to be the only partner Digimon able to evenly handle Myotismon in single combat at the time, a further nod to this trope.
Gag Dub / Woolseyism: The Saban dub is overall something of a hybrid in this regard, there were times when it acted silly - but it did definitely know how to be heartbreakingly serious when it had to be, not to mention its general aversion of Never Say "Die".
The dub was dubbed by the same company who worked on Samurai Pizza Cats so all the added humor in the dub shouldn't come off as very surprising.
Game Breaker: In-universe. That's basically what happens when someone enters the Digital World while holding a laptop computer. Izzy isn't able to enter full god mode on the Digiworld, but this allows him to use some shortcuts like access some hidden information about towns, analyse Digimon and perform a temporary upgrade on his own mon. In other words, he cheats.
Frothy Mugs of Water: Instances of tricking a Digimon to drink alcoholic beverages by changing it to Soda Pop in the English dub.
Gondor Calls for Aid: What Mimi and Joe end up deciding to do throughout the Dark Masters arc. Come the final battle with Piedmon, almost all of the children's surviving allies show up to participate in taking down Piedmon's army of Vilemon.
Gratuitous English: Adventure set the trend for the franchise absolutely loving this trope. Almost every attack name seen, and all of them for the main character Digimon and Big Bads. Adventure also set the trend for spurts of English sporadically appearing throughout the opening, closing, insert and evolution themes throughout the franchise, and most song names are also Gratuitous English.
Heroic BSOD: This happens with pretty much all of the kids, Matt and Sora probably taking it the worst.
Another very noteworthy one being near the end of the Etemon arc, when Tai learns that he is not invincible, simply because he exists in that world as a digital proxy of himself. He gets over it eventually, and awesome ensues when his crest awakens after an emotional 180 degree turn.
Heroic Resolve: Happens a lot, but probably the most noteworthy is in the final fight with Apocalymon. He digitizes the children and their Digimon after destroying their crests. Their combined Heroic Resolve allows them to both reassemble themselves and let their Digimon evolve to their strongest forms without the crests.
Heroic Sacrifice: A LOT of Digimon during the Dark Masters arc end up performing these for the children.
In Digimon Adventure The Movie, the Greymon Tai and Kari met sacrifices himself to destroy Parrotmon and save them.
Myotismon has a lot of these moments, especially in the Eighth Child arc. When he's taken an entire district of Tokyo captive, he decides to separate the children from the adults in order to locate the eighth child, relishing the mere thought of their cries. And prior to all that, he enslaves and torments the puppy-like Salamon.
Etemon and the Dark Masters have their moments; Etemon keeps hitting and bullying his Gazimon followers; the Dark Masters attack the Gekomon and Otamamon 'for the fun of it'.
Killed Off for Real: Since when Digimon die their data merely gets reconfigured and they start life over again, they technically can't really die. However this only applies to when they're in the Digital World, so any Digimon who dies in the Real World, most notably Gostumon, Pumpkinmon, and Wizardmon, stay dead.
Though apparently this rule doesn't apply to Myotismon, who dies in the real world and comes back. Then dies again, and comes back again in the next series. In fact, he's only killed off for good in the Digital World.
Kill Steal: Happens to MegaKabuterimon while fighting Puppetmon. MegaKabuterimon had already freed WarGreymon from Puppetmon's control, blown away his bullet hammer and injured him to a fair degree; all with a single well placed bolt of lightning. Puppetmon's forced to animate his mansion as a distraction and run away, until he runs into MetalGarurumon and Matt, whom he finds he's no longer capable of manipulating. He's promptly shot by the the duo after trying to charge them while injured with only an improvised weapon.
It's worth noting that none of the digimon she struck were incapacitated by her; They all were strong enough to fight off the several Devidramon that were sent to fight the chosen children after the fact.
Limited Wardrobe: Justified at first since they're stuck in another world. Not so justified when they temporarily return to earth for about three days and don't ever change clothes aside from pajamas (and even then Mimi is the only one shown to be in different clothes for any adequate amount of time.
Losing the Team Spirit: Tai's disappearance after the defeat of Etemon has this effect on the Chosen Children. The heroes eventually go their separate ways and fail to accomplish anything significant for almost three months.
Macross Missile Massacre: MetalGarurumon's Grace Cross Freezer attack fires every single missile it has from countless hidden stashes across his body.
Manipulative Bastard: DemiDevimon and Cherrymon. And Myotismon too, though unfortunately most of his manipulations had to be carried out by DemiDevimon; while he did do a decent job at first, he was too inept to make his machinations last long.
Meaningful Name: Sora means "sky", and Sora's partner is a bird-like Digimon. Hikari[Kari] means "light" and she has the Crest of Light.
Mood Whiplash: The Etemon arc. Etemon, a monkey-like Digimon who acts like an Elvis Impersonator, is sandwiched between the demonic Devimon and the Myotismon. Yes, he was no doubt dangerous, but he wasn't nearly as terrifying as the villain before or after him. This also happens a lot during the Dark Masters arc.
Never Say "Die": Completely averted in the original. In the dub, it's inconsistant depending on the episode; in general it did a decent job at averting it, with a few glaring exceptions:
When Myotismon claimed to "banish Pumpkinmon and Gotsumon to a dungeon in the Digital World" for disobedience. Riiiight.
But also averted in a sense. Digimon get killed—although they do get reborn—in the English dub, and one villain even says 'die' at one point (Ironically, it's Myotismon, the one who was the source of the death edit above. "When you find the eighth child, then he must DIE!")
Tai said Kari would have died during the first Machinedramon episode.
And in the following Machinedramon episode, there's Izzy's line "Sure, just let our Digimon DIE!"
Izzy also lets Tai know that while the Digimon may be reborn in the Digital World when they die. Humans can't.
Also the dub didn't shy away from what happened to Wizardmon, or the other digimon that died to protect the digidestined in the Dark Masters arc.
There is also this line of T.K.'s when being told that in order to make a miracle to happen, Angemon and Angewomon must shoot arrows at Tai and Matt. "But what if you like...die or something."
Nice Hat: Sora gets a fair bit of ribbing for her unusual headgear, which switches between being a helmet and being just a sort of toque. Mimi's pink satellite dish, meanwhile, goes unremarked upon.
Nice Job Fixing It, Villain: Nice job bringing Gatomon to her chosen partner and giving her the motivation to evolve into the one digimon predestined to kill you, Myotismon.
Nobody Poops: Averted with the Digimon, in spectacular fashion. Numemon, Sukamon, and Garbagemon use their poop as their main attack.
However the dub changes this to sludge. The only exception is they keep Koromon pooping in a car in one episode, though they didn't really have a choice since it was kind of a plot point.
No Celebrities Were Harmed: A vast majority of the non-main Digimon's English voices are based off of actors from the heyday of the voice actors' various childhoods, so this doubles as a Parental Bonus.
No-Holds-Barred Beatdown: Agumon is the victim of one of these from two Gazimon when the gang visits a Koromon village and finds the real villagers.
All four Dark Masters do this to the group in their first appearance. Later, Piedmon dishes an even nastier beatdown to WarGreymon before reinforcements arrive.
One Last Field Trip: After the final battle, the Digimon and their partners have a couple of hours together. Gabumon asks to hear Matt play his harmonica, While Tentomon spends time with Izzy and his computer.
The Operators Must Be Crazy: In one of the movies, when Tai is desperate to reach any of the other kids, but the phone lines have all been tied up by Infermon, a computer virus, he reaches a phone operator over and over who keeps telling him that the lines are busy in an increasingly frazzled tone until finally screaming at him "Did you hear me?! IT'S BUSY!!!!!"
After the kids first reached the Digital World, they ran into a bunch of payphones and, overjoyed, desperately tried to call their homes. Unfortunately, when they tried, all they got were a variety of non-sequiturs from the operators up to and including a weather forecast that included "a slight chance of ice cream." The operators in the Digital World must be either crazy or stoned.
Not so much when you really think of it. Fridge Brilliance kicks in when you realise the Digital World is the internet, and the internet communicates in frames of bits. The seemingly random communication they are receiving are corrupted frames, so they are hearing 2 parts of 2 different frames, one having to do with weather the other with food. It makes sence in context.
Rapid-Fire Comedy: The dub movie (especially the "Our War Game" segment) had loads and loads of surprisingly clever tongue-in-cheek and audio/visual gags. The dub of the main series also tended to do this.
Really 700 Years Old: Possibly, as time is much slower in the Digital World than the Real one. This has led to some dispute to over how old the Partner Digimon really are - They could be years to centuries old.
Redemption Demotion: That Lightning Bruiser status that Gatomon enjoyed as a villain? Disappears rather quickly once she turns good. Then again, by that point, Champion-level opponents were increasingly rare, aside from the Bakemon during the end of the Myotismon arc (who were so weak as to serve as mass Cannon Fodder).
To be fair, Gatomon's attack against the other Digidestined's digimon didn't exactly incapacitate them; They still had the strength to fight off the horde of Devidramon that was sent after them in Myotismon's castle after all.
Reincarnation: Although Angemon sacrifices himself to defeat Devimon, since destroyed Digimon turn back into eggs, he gets reborn.
Our War Game has two kids fighting against a killer digimon against the clock because the said mon, which is essentially a sentient computer program, is planning to fire nukes that it got access to by hacking the military. Even the name gives a clue to a certain 80's movie.
In the dub, Piedmon is voiced in the style of Tim Curry. It's a reference to another monster clown, played by Curry in an television adaption.
Shower Shy: In episode 8, when the Digidestined visit a hotel and take a bath (was it the first bath they'd had since summer camp!?), Joe is too shy to join the other boys. In the uncensored original, Matt and Tai try to force him to come in.
Single-Stroke Battle: Wargreymon vs. Machinedramon. Wargreymon depowers back into Koromon, with a cut appearing on his face. Machinedramon turns around to gloat, then falls apart into cleanly cut thirds before disintegrating.
Sliding Scale of Silliness Versus Seriousness: Moreso in the movie than the series (and much more so in the dub than the original, though it had its moments), it gets particularly jarring when an extremely emotional or suspense scene occurs, and one of the characters makes a joke that a fifth grader would think of.
To be perfectly fair, most of them are in fact fifth graders.
Spoiler Opening: Depending which station you were watching it on, the dub ending credits gave away the Ultimate level Digivolutions and the fact there was going to be another kid. Also, the champion/adult digivolutions, though all things considered only Angemon was really ever intended as much of a mystery or surprise.
It was worse in the original. The very episode that established the existence of the eighth child also happened to be the episode which started using the second ending credits theme, which prominently displayed the names and pictures of the eighth child, her digimon and its entire evolution line.
Partly justified since when Hikari was first introduced 6 episodes before the 8th child arc starts, it shows her Digivice, and expliticly states her destiny to join the chosen. There was also the fact that the Pilot Movie featuring Hikari was released before the show started, so it wasn't exactly a ruined surprise. Not so justified with Gatomon being her Digimon which could have been a surprise, but was ruined by the closing.
Not to mention that all of the champion forms were shown in the Japanese version three times every single episode: in the opening, in the back-from-commercials segment and in the closing credits. No form was really a surprise.
Spoiled Sweet: Mimi was always pretty sweet on the inside but due to growing up spoiled and sheltered, it took awhile for her to become able to show this to others.
Story Arc: There are neatly four 13-episode arcs in the show:
The File Island/Digivice Arc (1-13) featuring Devimon.
The Server Continent/Crests Arc (14-26) featuring Etemon, his aftermath, and the rise of Myotismon.
The Real World/Eight Child Arc (27-39) featuring Myotismon's campaign in the real world.
The Spiral Mountain/Dark Masters Arc (40-52) featuring the Dark Masters.
Afterwards, there's a two-part finale with the children facing Apocalymon.
Alternately, the season can be divided according to which villain dominated which part, such as the Devimon arc, Etemon arc, Myotismon arc, Dark Masters arc and Apocalymon arc, all [aside from last] in 13 parts.
Super Empowering: Humans are this to their partner Digimon, which is the entire point of the partnership. Kari occasionally becomes a more generalized version of this, occasionally exuding sufficiently powerful light to strengthen weakened Digimon and allow the team's Digimon to evolve to their strongest forms at the time. Of course, she only uses it in one episode.
Super Powered Mook: Snimon, an Champion digimon, is able to bring down Garudamon, an Ultimate, with a single swipe. To elaborate, Garudamon had already defeated Mammothmon and held off Myotismon himself when he was without the benefit of his fog barrier, making her one of the most competent partner Digimon at the Ultimate level. He also shrugs off blows from Were Garurumon with little ill effect and is able to hold a much larger and further evolved Zudomon for a considerable period of time.
The Team Normal: WereGarurumon is this compared to the other Ultimate level Digimon allied to the Digi Destined. While the other Chosen's Digimon have impressive displays of firepower, large size and/or magical powers to fall back on, WereGarurumon prefers to use mundane martial prowess.
Technology Marches On: The movie made a plot point out of Infermon taking over the phone system, forcing Izzy to get a wireless satellite uplink. This doesn't mean as much now that wired connections and phone modems have become obsolete.
Theme Tune Cameo: The song Mimi sung to wake ShogunGekomon in the original was the first ending theme, "I Wish". Mimi was also voiced by Ai Maeda, the song's artist, so they just had to use the prerecorded audio until he woke up.
Toilet Humor: Everywhere in the original, and cutting back on it was one of the things the dub really improved, if not carried out the best way. Can't be helped when there's golden poop Digimon, can it? Also, poor Koromon justified his level's English name "In-Training" at least twice.
Totally Radical: Numerous utterances of "Dude" and the like are sprinkled throughout the dub; understandable given when it was dubbed. In the fifth episode, for example, Greymon tells Tai that he's okay after being slammed into a canyon wall with "I'm stylin', dude!"
Tree Buchet: Episode 17 sports a particularly surreal example featuring a cruise liner and a giant cactus.
Troll: Arguably Diaborumon in the original. He didn't seem to have any real motive beyond feeding himself, and seems to have just been doing it all for shits and giggles; it doesn't help that the only vocalisation he makes in the entire film is a high-pitched giggle. The dub instead opts to give him something of a Freudian Excuse.
TV Genius: Izzy got this in the dub; in the original, it was more along the lines of him being merely very good at solving puzzles and handling computers.
Upgrade Artifact: The childrens' Crests, which allow their Digimon to evolve to the Ultimate level.
Villain Forgot to Level Grind: All four Dark Masters show that each one is extremely dangerous in their first appearance, with Piedmon alone taking out the combined forces of WarGreymon and MetalGarurumon, both also of the Mega level. But later on, the Digidestined had gotten stronger and more experienced through fighting their forces and while the Dark Masters are still a huge threat, they're not as big a one that they used to be and three of them are dispatched by WarGreymon or MetalGarurumon, both now very experienced. This is particularly clear with Piedmon, who they couldn't even touch in their first fight. Fast forward to when they meet him again, and most of the partner Digimon - including those only able to evolve as far as Ultimate - are able to put up a good fight with Piedmon, and he had to resort to turning them into keychains to avoid losing. Once they bypass that trick, he's gone.
Another notable example is Shellmon. When he is first faced it takes Greymon to eventually beat him, but during the Dark Masters arc when he's faced again the Digimon soundly defeat him without evolving.
Wake-Up Call Boss: Most first appearances of the new Big Bad serve for this, normally because they're a stage above the heroes at the time. Special mention goes to Enter The Dark Masters, which is pretty much an entire episode devoted to the Dark Masters beating the stuffing out of the Digidestined.
Episode 8: Devimon reveals himself to the cast, splitting them across multiple islands after luring them into a mansion.
Episode 13: Patamon evolves into Angemon in the nick of time, defeating Devimon, but at the cost of his own life and his data is reconfigured back into a Digiegg.
Episode 20: After defeating Etemon (and achieving the heroes' first Perfect/Ultimate evolution), Tai and Koromon are warped through a portal back to Tokyo.
Episode 21&22: Tai enjoys his time in Tokyo but finds out the disortion caused by their last fight is influenceing their world and causing multiple disasters all over the planet he then returns. After which, he finds out he's been gone for almost two months in the digital world and the others split up to find him, and during which the new Big Bad has been in the process of stealing their crest and deceiving them to keep them from using said crest.
Episode 27: The kids discover that there is an 8th child, Myotismon opens a portal to Earth, moving through with his forces, and the heroes are too late to get to him before the portal closes.
Episode 34: Tai discovers his sister is the eight Digidestined, while Myotismon finds out that Gatomon is the destined Digimon, kidnapping her and (temporarily) killing Wizardmon.
Episode 40: The cast finds out that the Digital World has been taken over by four extremely powerful, malevolent Digimon, who easily defeat the heroes, causing Piximon to perform a Heroic Sacrifice to save them.
Whatever Happened To The Mouse: Dub only. Myotismon condemns Gotsumon and Pumpkin to his dungeon. not kill, condemn. T.K. and Matt never think twice of trying to save them when they get back to the Digital World. In the original version, they weren't so lucky, but for the dub, it comes off as this trope.
What the Hell, Hero?: Tai in Episode 19. After Izzy comes up with the Idea they are all just data in the Digital World Tai mistakenly things this makes him Unkillable and decides to treat it more like some game. Everyone is displeased with this display, the most noticeable of them being Sora who questions his every reckless action during the episode. Thankfully he snaps out of it, unfortunately this comes after a brief Heroic BSOD when he realizes he could have easily died due to this recklessness.
An even bigger example of this for Tai is a few episodes early where he get cocky being the only one that has a crest and forces Agumon to eat a lot of food and pushes him around threatening to find a new Digimon and being generally rude to the other kids. And then putting himself in danger to induce Greymon's digivolution to Ultimate. Fortunately he learns so humility when his actions corrupt Greymon's Digivolution to the rogue and destructive Skullgreymon and Tai gets some character development in learning the real meaning of courage.
White Gloves: Five of the Digidestined (Tai, Matt, Izzy, Sora and Mimi) wear gloves, but only Tai's are white.
Machinedramon and especially Puppetmon are also guilty, the latter often doing it for entirely selfish reasons and especially where it's downright inconvenient for him. In the end, that's what does him in.
You Shall Not Pass: Piximon tries to hold back the Dark Masters to let the kids escape. He dies.
After Piedmon turns WarGreymon and MetalGarurumon into keychains, the fight against him become one long series of ineffectual YouShallNotPasses, with everyone trying to hold him off to let TK and Kari escape. Then MagnaAngemon turns up.
Biyomon gets a far more successful one against Meramon in the fourth episode to let the Yokomon and her friends get to safety. While she doesn't fare too well, her determination results in her successfully evolving to Birdramon for the first time to defeat him.
Your Size May Vary: Although pretty much every Digimon, and especially all of the main Digimon, experience these issues from time to time, the worst offender is probably Greymon and his evolutions, which could be anywhere from 20ft tall to the size of a skyscraper.
Mega Kabuterimon could be a pretty big offender too. He's one of the Digidestined's biggest Digimon, bigger even than Metal Greymon and usually looking to be at least 40-50 feet tall. Then in some scenes, he's only about 2-3 times the size of Angewomon, who's just a bit taller than a human.