Dark King: Where do you get such power? Nagisa: You've made a mistake! You're not just fighting the two of us... Honoka: ...you're fighting all the life on this world! All that life is connected through us!
A special attack that uses the combined energy of everyone in a cast with the coup-de-grace, usually but not neccessarily, being delivered by the lead. It can be an actual attack technique, or it can be used as a powerup for something, such as an attack.
A common subtext to the trope is that the worst villains are inevitably weaker because they don't have friends to rely on (see The Power of Friendship). It's also a handy way of showing that the hero is very strong without nullifying the importance of the other cast members. Often combined with Gondor Calls for Aid, when the main group needs more energy than they themselves can generate. May be fueled by Innocent BystandersFighting for Survival. May include the Power of Trust and/or Clap Your Hands If You Believe.
Not to be confused with Combination Attack or Combining Mecha or All Your Powers Combined. This is just about collective energy which even the most faceless and generic Muggle can provide.
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Anime and Manga
The Genki Dama/Spirit Bomb in Dragon Ball, which is powered by living things lending their energy to a good heart, is the former Trope Namer. This evolves throughout the series. The first time it's used, it's just the planet's power itself. The second time, it draws on the power of other planets and moons nearby. The third time, everybody on Earth sent power, only to be outdone by the final time, where everybody he'd met across the universe helped. It should be noted that despite all the trouble involved in using it, until the very end of Dragon Ball Z the Spirit Bomb never actually works.
In the series at least. In the movies it has a much better track record, killing Dr. Wheelo, Turles, and Lord Slug, and a variation is used to destroy Super Android 13.
In the Budokai games, Cell is able to use a green version of the Spirit Bomb, despite being a villain. Some believe that Cell was able to use it because he was pure of heart, but pure evil instead of good. Based on a throwaway line he says while charging it, other fans jokingly theorize that Cell uses a different energy source called "Stupid Energy".
Cell: Okay, planet, give me that stupid energy!
Baby had a variation called the Revenge Death Ball, which gathered the hate of everybody on the planet.
GT also had Omega Shenron's negative energy ball, made up from all the evil committed throughout Earth's history. The invincible Gogeta just turned it into a "heal the world ball" with a touch.
For a non-Spirit Ball example, the 8th Z movie ends with Gohan, Trunks, Piccolo and (eventually) Vegeta giving Goku their remaining energy after Broly beats all five of them to bloody pulps.
Nanoha's Starlight Breaker is similar to the original Spirit Bomb in that it also gathers ambient magical energy from the environment into a large energy ball.
Ichigo powers up temporarily at times in Tokyo Mew Mew by taking on some of her friends' powers. In the manga, this also takes their weapons and combines them into the gigantic Strawberbell Version Up.
Episode 13 of Keroro Gunsou has the Keroro Platoon beating rival alien invader Viper by going into a series of Toku/Sentai inspired poses, leaps, and sound effects, ending in a team-up super-attack based around basketball metaphors (though Keroro messes up and uses golf: "Nice Shot!").
Yes! Precure 5, halfway through, gives the girls weapons. Combining the five weapons together turns them into a giant mecha-butterfly, allowing the girls to perform Pretty Cure Five Explode. In Yes! Pretty Cure 5GoGo!, they all get swords, allowing Pretty Cure Rainbow Rose Explode, which involves combining giant man-eating flowers. Yes.
Not to mention the actual birth of Omnimon resulting from the outpour of support from many Internet users worldwide.
And the fourth movie had half of Tokyo redirecting its collective goodwill for the heroes through their cellphones, which inexplicably took the form of a BFS for their 30-foot-tall cyborg dragon-man.
Digimon Frontier's highest Evolutionary Levels required that all the other characters' digivoling power be given to the two who can evolve that far, essentially resulting in all but those two being Brought Down to Normal (as once villains started getting tough enough to require these forms frequently, most of the characters' roles became to simply empower the The Hero and The Lancer and get out of the way.)
Of course, then they realized that this strategy didn't work, as the only time they even managed to frighten the current villains was when they all used their normal transformations along with some of the dead bad guys. Subverted Trope? Maybe.
The final evolution was the ultimate example though, merging all the good guys and defeated foes to work together.
In the final episode of Shaman King, Yoh defeats Hao by channeling the spiritual energy of everyone on Earth.
The third season of Slayers ends this way, with Lina doing the honors.
A good deal of battles, particularly arc-ending battles in Saint Seiya end with Athena's Saints (usually just the Bronze Saints, but sometimes the Golds if they're available) willingly relinquishing their Cosmo to either Seiya or Athena herself to deal the final blow. Even more notable in that the Saints' patron constellations (like Cygnus, Draco, Phoenix, Andromeda, or Pegasus) manifest visually as helpers to the character delivering the attack.
Of course, their ability to defeat Lady Debonair in the anime because everyone is believing in them is the second. "CURSE YOU, MAGIC KNIGHTS! CURSE YOU, PEOPLE OF CEPHIRO, AND CURSE THE HEART THAT BELIEVES!"
...that and stabbing her in the face with pure omnipotence.
It's later revealed that since they all have the same origin, any four of the nine armors can upgrade the Wildfire armor to the Inferno.
Zettai Karen Children has Kaoru attempting one of these in a clear parody of the Dragon Ball one, only she asks for the energy of perverts.
And then there's the "force of absolution."
During the showdown with Nakago in Fushigi Yugi, Miaka and the other Celestial warriors send all of their power to Tamahome to enable him to take Nakago down.
Pokémon Special is pretty fond of this. The two main instances are at the end of Yellow saga, where Yellow somehow absorbs the attacks of the Kanto starters into her hand to power up Pika's Megavolt, and the end of the Emerald arc, where the nine starters each fire an Elemental Hyper Beam at the fake Kyogre, with two Pikachu and their Pichu child finish it off with a flying triple Volt Tackle.
The Shuffle Doumeiken (Shuffle Alliance Fist) from G Gundam. Similar is one of Kyral's ultimate attacks, which super-charges his allies with power, turning them all into highly destructive comets.
Chain/Team Soul Resonance in the Soul Eater anime. Best demonstrated during the Brew arc by Maka, Black Star and Kid, where the combination of the soul wavelengths enhanced the group's strength, awareness, and agility as a team (at one point, Maka 'knows' when to duck after attacking Mosquito, just in time for Kid to shoot him at close range). The team effort was concluded with the Soul Resonance attacks of each team, ending with Maka's newly-realised Demon Hunter.
Not so in the manga, where Soul ends his black-blood provoked piano recitation before Maka attacks.
The second team of students, made up of Ox, Kirikou and Kim, also use the technique during the same mission.
The Tengen Toppa Gurren Lagann from the end is a closer example.
From the second movie: Super Tengen Toppa Giga Drill Break uses the power of the entire Team Dai-Gurren (and it's implied the rest of humanity as well) in a single awesome, pocket-universe collapsing finisher. Also, the Anti-Spiral Giga Drill Break is a villainous example, using the power of the entire anti-Spiral species at once. Guess who wins?.
The final battle with Yakumo in YuYu Hakusho Poltergeist Report should count here. Yusuke's Spirit Gun, Hiei's Dragon, and Kurama's Whip, and Kuwabara's spiritual energy sent Yakumo through a skyscraper, top to bottom. It may not have completely killed him, but it was pretty damn cool.
In Yu-Gi-Oh!, Yami Yugi defeats Yami Marik and the Winged Dragon of Ra in the Battle City finals with "Ragnarok," a card that removes every monster from his Deck and Graveyard from play for its cost. All the monsters then come out and lift Ra out of the field, including Kuriboh! (In the manga, they cling onto Ra and explode.)
In the Doma Arc, Yami calls out to everyone who had been captured by the Great Leviathan to give him strength—although each individual may be insignificant, their combined forces help Yami defeat Leviathan.
In the Gash BellThe Movie, the spell Bird Force combines the energies of Gash and his friends into a giant Pheonix.
This technique is reused later in the Harukanaru Toki no Naka de - Maihitoyo movie, except that instead of summoning the Dragon God, Akane was using her purifying/sealing powers.
Beyblade has a couple of these. The Bladebreakers are on Lake Baikal, facing Black Dranzerified!Kai. He beats them, all easily one by one, but then they use all four bitbeasts, with Tyson somehow wielding both Dragoon AND Dranzer, and thus Kai is finally beaten.
A slightly shaky fit, but in Ray's final Crowning Moment of Awesome against Bryan he pretty much outright states that it is the power of his friendship that enables him to dig in and wrestle victory from the jaws of defeat.
Tyson's battle against Brooklyn; almost every 'blader with a television and a bit-beast clubs together to give him the ultimate power boost.
Genki in Monster Rancher did this a few times, channelling and magnifying the energy of the whole group into a massive energy attack. Also he is the only one with the ability to draw on the power of every good person (monsters included) on the planet in order to resurrect and power the phoenix. And still has some left over.
They use this in the Final Battle of Cardcaptor Sakura to defeat Eriol. Sakura is still unable to transform the powerful Light and Dark cards on her own, so Cerberus and Yue combine their powers (combine themselves really) into her staff; that combined with Sakura's famous willpower is apparently enough to do the job. Syaoran tried to do the same, but it didn't work out too wellforhim...
This is how the Zanpakuto Rebellion arc of Bleach ends. The zanpakuto spirits all contribute their energy to Renji, who uses it to defeat the final Sword Beast.
An interesting non-combat example happens in Transformers Cybertron, when most of the good guys and a large number of faceless generic Transformers team up to manually align a rocket booster to save the Jungle Planet after it was damaged by a surprise attack by Galvatron For the Evulz. The combined power of every Transformer present creates/summons the Spark of Primus from each of their individual sparks and not only ensures the success of their endeavour, it also enhances the effectiveness of the rocket booster and smoothes the whole process over in a dramatically convenient and climatic way.
In Fairy Tail, two or more mages with different types of magic can combine their powers to launch a super attack generally called Unison Raid to defeat a powerful enemy,
Lucy and Juvia combined their power to beat Vidaldus during the Tower of Heaven Arc.
Rogue and Sting launched their Dragon Force-enhanced Holy Shadow Dragon Flash Fang attack at Natsu.
The entire Tenrou Group combined their powers with Laxus to fight off Acnologia.
The Star Wars Expanded Universe had the Thought Bomb, one of the most powerful and destructive applications of the dark side of The Force, created by many powerful Sith Lords. It was so powerful that it not only killed every Jedi in its radius, but the Sith who created the bomb as well.
In the Ultimate Galactus mini-series, Jean Grey and Professor X, combining their power with an enhanced version of Cerebro, link every human on the planet to beam thoughts of living at Galactus until it got scared off. Well, vaporizing 30% of it by shooting a goddamn Big Bang at it helped too.
Prof X pulled something similar in the original X-Men comics: He went into hiding for months (with the dying Changeling taking his place among the X-Men) and linked every mind on Earth with his to fend off an impending alien invasion.
In an Age of ApocalypseAfter the End issue of What If?, Dwayne Taylor uses technology from the Watcher's Dome to give himself incredible powers to fight off Galactus but, after seeing his brother die, uses a Combined Energy Attack instead to take down the monster.
Another X-men example. During a mission in Russia, X-men got into a fight with a one-shot villain Soul Skinner, a telepath who got a serious Power Born of Madness upgrade after discovering his wife was an undercover kgb agent monitoring him (and that she let their daughter die to avoid blowing her cover). With the X-team on the verge of losing, Psylocke performed a rather unusual move: she found a group of children hiding in a nearby building (the only people in town who hadn't yet been turned Empty Shell by Soul Skinner's rampage) and linked their minds into her psychic knife. Then she stabbed Soul Skinner with it. Since his powers were pretty much powered by Wangst, the concentrated Children Are Innocent shut down his brain.
Used in a bizarre manner—perhaps subverted or parodied—in an issue of the original What If? series. Korvac, a Knight Templar who wants to create a perfectly ordered universe, is opposed at every turn by the Marvel Universe 's cosmic beings (mostly because his plans involve slaughtering them). At the end of the story, Korvac absorbs the powers and life force of every being on Earth, starting with his allies, in order to face off with an alien armada and destroy the universe. It was even lampshaded by the editors in the letters column, when one fan questioned whether Korvac was really strong enough to kill all the Celestials on Earth at the time—they argued that if all those cosmic beings, plus the superheroes, plus every living being on Earth wasn't enough to kill one Celestial and absorb its powers (then go on to the next till finished), they didn't know what was.
In the classic X-MenDark Phoenix Saga, all of the X-Men donated part of their life forces to give Jean Grey the strength to repair the M'Kraan crystal.
In the Day of Vengeance DC miniseries, Sorceress uses the combined power of every magic user in the DCU to fight The Spectre. It wasn't enough.
Scott Pilgrim's cast comes together in an equally defensive and offensive version of this at Scott's first fight with Matthew Pattel.
The Elements of Harmony normally work like this in My Little Pony: Friendship Is Magic. In the fanfic Arrogance And Envy, they also power up by individual Spirit Bomb effects once their users "awaken" - for example, Pinkie Pie (Laughter) gains extra power from anypony she can cheer up, while Rainbow Dash (Loyalty) is powered up when those she fights for root for her.
The anime movie Harmageddon had the heroes combining their powers to defeat an extraterrestrial power.
Angels in the Outfield: In the deciding game, a variation of this is used: No angels will show up to the championship game because The Rules state that championships must be won without supernatural help. However, to inspire Mel, the pitcher, to strike out the final batter, coach Knox and Roger fake an angel appearance by using the "angel signal" to trick Mel into thinking he has an angel with him. What Knox and Roger didn't anticipate was that the entire stadium full of fans would mimic the signal in order to give Mel the confidence and courage needed to throw one more strike. After he gets the last out, Knox tells Mel the truth.
At the climax of Gamera II: Advent of Legion, our hero destroys his foe with the Mana Beam, the force of which is channeled directly from the life of Earth itself.
In the initial three "BIONICLE" films, the six main characters in each film normally unleash a combined elemental attack; this is seen in the comics as well, where the Bahrag are vanquished by the Toa Mata combining their elemental powers, and in the second film, Legends of Metru Nui, where the Toa Metru combine their powers to seal away the main villain. In the third film, Web of Shadows, the three Toa Hordika combine their elemental spinners to 'kill' the main villain.
The "prayers of the saints" are what literally empower God's Angels in This Present Darkness and Piercing The Darkness by Frank E. Peretti.
Similarly to Ameterasu in Okami, deities in Terry Pratchett's Discworld books do not, specifically "attack" anything, beyond the odd thunderbolt, but they require the belief of their followers in order to maintain power and status as gods. Some gods go to great lengths to prevent this from happening-Blind Io, for example, is in fact EVERY thunder god in every pantheon across the Disc, and has over seventy hammers, thus ensuring that even if one particular thunder god's worshippers die out or convert, he is still riding the gravy train in Dunmanifestin.
The Great God Om, in "Small Gods", was very nearly reduced to the wisp of consciousness that is the fate of all fallen gods, because all but one of his followers had lost sight of the God and simply believed in the Church. Though by channeling the renewed belief of an entire natioin at the end he becomes mighty.
The Children of the Lens, in the Lensman series, focus the Psychic Powers of trillions of Lensmen across two galaxies into a single blast which finally destroys the evil Eddorians.
In the Foundations Edge story by Issac Asimov, the Second Foundation creates a linkage of all of their mentallics to counter a new threat. The telepathic planet blocks the link to the connection.
This is basically the point of Tamora Pierce's original Circle of Magic series — in Sandry's Book, the title character weaves together the magics of the four leads, making them all stronger, and each of the subsequent book titles (Tris's Book, Daja's Book, Briar's Book) tells you which of the four takes the initiative this time in using their combined magics to resolve the plot.
In The Rowan, the first book of Anne McCaffrey's Talents series, humans who are telekinetic and telepathic can "merge," making the "focus" of the merge into a much stronger telekinetic. The Rowan does this with her support staff to deal with an incoming missile, and with four other extremely strong telekinetics to deal with some invading aliens; when the invading aliens turn out to be the preliminary wave of a much bigger invading fleet, she and her husband, respectively, serve as the foci for merges of every psychic woman or man in the galaxy.
Live Action TV
It is the entire premise of the TV series Charmed, and is used at varying degrees for both heroes and villains. The most common reference in the show is to the Charmed Ones being unique because they have "The Power of Three". Many demons and other magical beings can only be destroyed using a spell cast by all three sisters together. However, it continues to escalate throughout the series to include more family members... In order to defeat the Source of all Evil, the girls use not only the Power of Three, but also call upon the power of their entire ancestral line of witches. In the series finale, this is taken a step further by calling on the powers of not only their past family members, but also their children from a future generation.
In Buffy the Vampire Slayer's season four finale, "Primeval", Buffy's friends pump up her strength with theirs using a magic spell, so that she can fight the demonic cyborg Adam.
Most seasons of Power Rangers and Super Sentai feature an uberweapon formed by combining the melee weapons of the individual rangers.
Also used in the Power Rangers Mystic Force finale, when the human and mystic communities unite and their support supercharges the Rangers' magic.
Gosei Sentai Dairanger features a more typical Combined Energy Attack as the Dairangers' first on-foot finisher: The Chi Power Bomber attack.
In the 199 Heroes movie of Kaizoku Sentai Gokaiger, all of the previous Super Sentai teams lend their power to the Gokaigers and Goseigers, forming the Super Sentai Bazooka.
In the Doctor Who episode "The Last of the Time Lords", over the past year, Martha has been travelling the world, telling people to think of the Doctor at precisely zero on the Master's countdown; the Doctor, interfaced with these people through the Master's own psychic control network, shines with power and defeats the Master. Some thought this ridiculously cheesy and What Do You Mean, It's Not Symbolic??, while others thought it incredibly awesome.
In the finale of Kamen Rider Den-O, the super-powerful Death Imagin is defeated by a Combined Energy Attack version of Den-O Sword Form's Extreme Slash, where the blade detaches and strikes the opponent...except that this time, each of Ryotaro's allies "catches" the blade in mid-flight, imbues it with some of their power, and throws it at Death, before Den-O catches the blade, dashes in, and hacks it up with a flurry of All Your Colors Combined slashes.
The climax of the Kamen Rider Double movie has the Big Bad Kamen Rider Eternal fling Double from the tallest tower in the city. The people of the city, seeing their hero in trouble, begin shouting "Kamen Rider!" and wishing for his victory. This causes the winds to blow through the turbine in Double's belt, triggering an Up to ElevenSuper Mode transformation that lets him fly back up to Eternal and take him down.
Kamen Rider Fourze has a version of this by default with his Super Mode, Cosmic States, which draws its power from the bonds between him and his friends. His movie-exclusive Meteor Fusion States is even bigger in this regard, since creating it required the efforts of forty people with strong bonds with Fourze; he himself even tells the villains that it's not just his power, but the power of everyone he calls "friend".
Used in a recent arc of The Sarah Jane Adventures, where Luke, Clyde and Rani realize that together, they're strong enough to defeat the Nightmare Man.
The finale of Ultraman Tiga has every child on Earth channeling their light into Ultraman Tiga, transforming him into Glitter Tiga and joinning him in firing his attacks.
In Exalted, the Dragonblooded Exalted represent the very epitome of this trope and All Your Colors Combined; when they throw Elemental Bolt or Elemental Burst together, their powers aren't just cumulative - the whole is greater than the sum of the parts. When they channel their power through the toughest of them (the maximum raw power is determined by the toughness of the caster), each may add as much to the attack as s/he can. The focus is also the one who determines base accuracy, which increases (along with range) for each participant. Lastly, the elemental effects combine; with all five elements in one attack, you are subject to a localized earthquake, hurricane-force winds, drowning by pulmonary edema, set on fire and infected by a relatively harmless plant venom - all at once.
Eg; with 5 Essence 2 (rookie, in other words) Dragonbloods throwing an Elemental Burst together, count on at least 10-15 levels of damage to everyone within a radius of 10m, practically guaranteed to hit, and the whole thing has a minimum range of at least 200m. Basically enough to wipe out a squad of un-Exalted humans or hurt a small group of Exalts. Pull together a company of veterans, and they'll throw around blasts that can level city blocks and blast the shit out of anything short of Primordials. Also note that during the First Age, the Dragonblooded were the common soldiers, and numbered in the millions.
Affinity: The card's cheaper for every X you control, where the card has affinity for X. A variant exists with three cards in Urza's Saga where they count a particular card type.
Slivers: They share abilities.
Domain: There are five basic land types. Control 1, you get an effect of 1. Control 2, you get the effect of 2. Et cetera.
Last Stand and friends: These cards count the number of a given basic land type. (Last Stand counts all five.)
Collective Unconscious, Keldon Warlord, and friends: These count type rather than subtype but are otherwise the same as Last Stand.
Exalted: Like the aforementioned cards, only it only applies when exactly one creature attacks, and it gets stronger for every other creature.
Allies: Allies have abilities that activate when an ally comes into play, count your allies, or both.
Defender: Continuing Zendikar's list of "things that are usually bad or neutral are now good" (auras, excess land, Awesome but Impractical big creatures), we get defender, which means this creature can't attack, but in Zendikar, a lot of creatures with defender give bonuses to the player if there are more creatures with defender.
Counting cards in hand or graveyard. This can also hurt a player, as is the case of Black Vise.
Lords invert this, granting more power to each creature of the same tribe, or something similar.
The final stage of Osu! Tatakae! Ouendan involves the cheerleader protagonists leading the people of Earth as they combine their ki into a massive blast of energy in order to save the world from impact with a huge meteor. In Ouendan 2, the two rival cheerleading teams join up to cheer the people of Earth on as they combine their power to keep the sun from going out. In the American version and Spiritual SuccessorElite Beat Agents, our heroes do much the same thing to destroy the mothership of the music-hating aliens invading the Earth.
In the final stage of Space Channel 5, the Big Bad disables the sound system on Ulala's spaceship, rendering her unable to follow his patterns... until the scores of people she helped in the game previously show up and provide music in the form of an a capella version of "Mexican Flyer", the game's theme song. At the climax, the people focus their energy on a radio antenna in order to power up an energy blast big enough to blow away the bad guy.
Sora has a wide range of combination attacks with his party members, but only the Sora-Donald-Goofy Trinity Limit really applies. It's the only one to involve the entire party, and both versions so far end with them combining their power into a ball of energy that wipes out anything in the vicinity.
The Drive system of Kingdom Hearts II - Sora can temporarily use the power of one or both of his allies to access a Super Mode with more powerful abilities.
Terra, Aqua and Ven have their own version of Trinity Limit in Kingdom Hearts: Birth by Sleep, but you can only use it once in the main story (multiplayer is another matter). Aqua uses something similar in the final battle of her scenario, calling out to Terra and Ven to lend her their strength. She uses this power to destroy the X-Blade and defeat Vanitas.
In the final battle of Alundra, all of the townspeople pray for the main character's victory, and the prayers' energy fully restores your health and magic at the beginning of the battle.
EarthBound's final boss fight ends on such a note as well through the Prayer ability, invoking the prayers of everyone the heroes have encountered, ever — eventually breaking the Fourth Wall and asking the player for his prayers.
There's not one, but two Combined Energy Attacks in Skies of Arcadia. The first, Prophecy, has the entire party call down a giant moon on their opponents for a huge amount of damage. The second, Blue Rogues, has the crew of the party's ship either dealing damage to the enemies or healing the party. Either Combined Energy Attack also makes the enemies skip their turn. Both of these require your Spirit Points be at full, though, so most players don't use them often.
Though it is not a specific attack, Amaterasu in Ōkami was only able to gather the energy needed to defeat the Big Bad when the world finally realizes that she's more or less God and offer her their prayers.
Inverted in Final Fantasy VI: Sabin's Mantra splits an amount of HP equal to his to every other party member, divided by the number of other party members. This is actually useful, as in the World of Ruin, he's the second party member you get.
In the Blitzball minigame of Final Fantasy X, Wakka's special shot Auroch's Spirit has the effect of combining his SH (shoot) stat with the SH stat of all the original Aurochs (Himself, Datto, Letty, Jassu, Botta, Keepa) that are on the field.
Also spoofed sometimes—a few of the combinations are not inuitive and are tied together by stuff like mutual status as Bishounen.
In Eternal Fighter Zero, Ikumi Amasawa's Final Memory attack, "Sword of Friendship", calls out her four friends from the game MOON to attack her foe, with Ikumi herself delivering the final blow. If the attack doesn't finish off the opponent, Ikumi and her friends will strike a pose together as her opponent plummets back down to the ground.
The way it's executed is a huge Shout-Out to Captain Commando's Captain Storm, not that it's any different from any of the other countless shout outs in the game...
And even before the battle, he had acquired the power of The Universe through the bonds he had forged with various other characters.
This happens again in Persona 4, in both forms. After technically beating the cosmic entity and learning that they can't proverbially punch out Cthulhu, the Protagonist collects the powers of the bonds he's formed and summons his ultimate Persona to deliver a proper knockout blow on behalf of humanity.
An outright shameless 'Combined Energy Attack' appears in Wild ARMs 4, in the form of the Arc Impulse group attack. Initially just an energy blast the four character pull off by reciting, rather cheesily, about positive philosophical concepts, the final boss being reduced to 1HP grants them an 'upgraded version' with which to strike the killing blow. This version results in the four pulling together a giant, combined ARM, and reciting a new set of cheesy philosophical lines, proceed to blast it into oblivion.
Arc Impulse's first appearance in the series was very similar: in the final battle of Wild ARMs 2, the main character uses it, gaining more and more power from the wishes and friendship of just about everyone in the world, dealing more and more damage to the final boss, until the protagonist's Love Interest makes her speech...which, of course, gives him enough strength to deal a whopping 99,999 damage, destroying the boss for good. Forget "freaking brilliant," this is quite possibly the series' ultimate Crowning Moment of Awesome.
Phantasy Star IV allows the PCs to combine their attacks. The immensely powerful Destruction combination attack requires simultaneous action all four mandatory party members: three combine their most explosive attacks, and the fourth puts up a shield so the party doesn't get nuked.
This happens in the final boss battle of The World Ends with You. Although you start the battle alone and almost hopeless since your partners have been absorbed/captured by Megumi, dealing damage allows Shiki, Joshua, and Beat to send their light pucks to Neku, multiplying your damage ratio higher and higher until Neku finishes the fight by funneling it all into his hand and firing it as a beam of light, actually ripping Draco Cantus' flesh off of its bones. And you though Nekozilla was a powerful fusion.
How could ever forget about the ending to Warcraft 3: Reign Of Chaos. Thousands of wisps simultaneously detonating packs enough life energy to cause the demon Archimonde (who managed to trash you and your allies bases in the last mission of all the campaigns) to explode in a massive firestorm.
The "Collected Power" card from Yu-Gi-Oh! is most likely a reference to this.
In .hack GU during the final battle against Cubia the Epitaph Users give all their power to Haseo and then when he can't even defeat it because he's missing one epitaph user, Ovan comes to the rescue. Afterwards its one attack and then Cubia is gone.
Inazuma Eleven has "The Earth" shooting technique, performed by Endou, Goenji, and Fubuki by channeling will power of every active players in the team to create a huge energy ball before kicking it toward the goal. After learned, however, the player can have Endou abuse it in ever match without any need of gathering the power thing, in contrast to the anime adaption, where the skill is used only once throughout the series.
X-Men example: The animated adaptation of the Dark Phoenix Saga ended with every X-Man on the team giving a portion of their life forces to bring the de-Phoenixed Jean Grey back to life.
One of the countless magical artifacts in Xiaolin Showdown, the Sun Chi Lantern, allowed one person to gain the strengths and abilities of his allies as long as they were within the lantern's light radius. Naturally, it was only used once.
The heroes pull one off in the animated special, Freaknik: The Musical. This one is unique in that it saves Freaknik and is used to defeat the big bad.
A bizarre example in Futurama: Because of the massive pollution caused by the robot population of Earth Wernstrom and Nixon have aimed an EMP cannon at the Earth with the intention to destroy all robots (who have been gathered at the Galapagos Islands under the guise of a party for this reason). In order to save the robot populace, every single robot on the planet has to blast their exhaust upwards to propel the Earth of the cannon's line of fire, incidentally moving the Earth further away from the Sun, solving the global warming problem.
ThisCollar 6 strip seems to be hinting at a rare VILLAIN example of this trope.
The FreakAngels used a small version of this to break through a police roadblock. They then broke the country, at the very least, a few minutes later.
Solarnight from Phaeton is implied to be this, but its effect is a mystery.
Japanese Giant Hornets are horrifying to those familiar with them. Thirty of these hornets, each the size of a person's thumb, can annihilate a hive of thirty thousand bees as seen here. However, the bees native to Japan have evolved a defense that involves a bee and about a couple hundred of her sisters that can only be described as a real life Combined Energy Attack. See it here.
BOINC, for computers. Combining the processing power of volunteered personal computers all over the world via the internet, the network can achieve performance outputs equivalent to large supercomputers. It's used for executing computationally intensive tasks in all manner of scientific research, including physics, biology, astronomy, meteorology, and more.