Supreme Power Can Be a Weakness

Sometimes, supreme power can be a weakness. In other words, in many a story, the antagonist is defeated by the power he or she sought. This is one of the most unpredictable moments in a film, book, or play - usually during the climax.

When the villain is defeated by the power he sought, this occurs in these circumstances:
 * The villain initially plans on using a powerful object, henchmen, or a monster to use for his or her own gains, but this backfires, defeating the antagonist.
 * The villain gets the power he wants, but it destroys or imprisons him.
 * The villain outright wins, but his victory leads to his undoing.

Examples

 * Archibald Snatcher finally achieves his dream of eating cheese in the Tasting Room, but his allergic reaction sets off, killing him.
 * Scar initially planned on employing hyenas to help him usurp Mufasa and take over the Pride Lands, but when he blames them for causing Simba's woes, they turn against him.
 * Ruber plotted to obtain Excalibur's power, but Kayley and Garrett trick him into plunging it into the stone, destroying him.
 * Vic Hoskins initially planned on cloning dinosaurs and using them as weapons, but when he tried convincing Blue that he was on his side, the velociraptor turned against him.
 * Ronan the Accuser plotted to use an Infinity Stone to cleanse Xandar, but its power destroyed him.
 * Rene Belloq, Toht, and Colonel Dietrich were intent on harvesting the Ark of the Covenant's power, but it causes their downfall.
 * Jafar finally obtains the power of the lamp when Aladdin tricks him into becoming a genie, but is bottled up in a lamp.
 * Chick Hicks wins the Dinoco race, but is booed by the crowd and even his own fans for cheating and pushing The King off the track.
 * Joe initially plotted to gain unlimited power and intelligence by drinking the antidote to the fish potion, but it turns him into a human. He realizes that a human can't breathe underwater and eventually drowns.
 * Doc Ock plotted to harness the sun's power, but sacrificed himself to save the city, and this power leads to his downfall.
 * Judge Doom plotted to wipe out all toons with the Dip, despite being a toon himself. Eventually, he gets splashed with it himself and melts like the Wicked Witch of the West.
 * Morgana plotted to harness the power of King Triton's trident to take over the ocean, but when Melody gives it to her grandfather, Triton imprisons the sea witch with the powerful weapon.
 * Sa'Luk plotted to achieve supreme power by obtaining the Hand of Midas, but makes the mistake of touching the gold part, causing him to turn into a statue and leading him to be literally trapped by his own greed.
 * Max Mordon plotted to obtain immortal life from a gold idol, but it turned him into a mummy and he was arrested by the Mummy Chief's guards.
 * Mandrake was defeated by being trapped by his own tar.
 * Tortoise John plotted to use Rattlesnake Jake in his plan to rule over Dirt, but Jake turned against him for his treachery.
 * Brad Uppercrust plotted to use his team, the Gammas, to cheat in order to win the X-Games. But after he crossed the line by deliberately leaving Tank behind in a blazing fire, Tank turned against him.
 * Red Skull/Johann Schmidt was defeated by the immortal power he plotted to obtain.
 * The Horned King plotted to use the Black Cauldron's power, but after Gurgi jumped in, that power destroyed him.
 * Krudsky initially planned on using the Goblin Scepter to control the powers of Halloween and bribe the Goblin King for his own selfish gains, but Shaggy and Scooby-Doo defeated him with the scepter and the king imprisoned him for his treachery.

Quotes
"(After the treasure chamber turns to gold, water begins to pour into it.) (Cassim: Time to go, Aladdin!) (Suddenly, Sa'Luk jumps out of hiding and knocks Aladdin down!) No one's going anywhere. Give the Hand of Midas to me, Cassim, or your son dies! (Cassim, firmly: Sa'Luk, your battle is with me!) (Aladdin: Don't worry, Dad. I can take him alone.) (Cassim: But you're not alone. Not anymore. (calls out to Sa'Luk) You want the Hand of Midas, Sa'Luk? Take it!) (Cassim tosses the Hand of Midas to Sa'Luk, who pushes Aladdin out of the way and grabs it.) The Hand of Midas is mine! (Sa'Luk laughs with evil glee.) And also, the life of your brat. (Cassim gives him a fierce stare.) What are YOU staring at? (Aladdin notices this and Sa'Luk does too - the greedy thief has touched the golden part of the Hand, which begins to glow. Suddenly, without warning, a golden light travels up Sa'Luk's arm!) No! No! (Sa'Luk gives out a yell of monumental proportions as he is turned into a golden statue. Then, he tumbles into the water and sinks like a stone.)"

- Sa'Luk literally trapped by his own greed as he obtains the Hand of Midas. "(Max Mordon has finally seized the golden idol.) Too bad, Toad! Loser! (Tad Stones: Now he's gonna be immortal!) (The Mummy Chief holds Tad back with one arm.) (Mummy Chief: Don't get any closer! Just wait.) (The idol's magic engulfs Max and he raises his arms in triumph.) I am FULL OF LIFE! (Max, Sarah, Professor Lavrof, and the Mummy Chief watch as the doors to the Inca City open up. Max yelps and writhes as he is suddenly wracked with pain and his fingers turn thin and spidery.) What...what's happening to me?! (Mummy Chief: You may BE immortal, but not as you would expect.) (Bandages wrap themselves around the fiend, and Max is turned into a shriveled-up mummy as the doors open. Sarah gasps. Max looks at his wrinkled hands.) (Mummy Chief, tossing the idol into his hand: This is the price of eternal life, Max Moron.) (Max, not believing his ears: No! No, this can't be! Sarah, help me!) (Sarah, pushing Max away: Get away from me!) (Mummy Chief: Don't worry. You're still quite handsome for a mummy, really. You'll fit right in here.) No! There must be an antidote to reverse this curse! (Professor Lavrof: No, there isn't. This is the reason why the mummy's still alive.) (Sarah, firmly: Mummies can't be alive. It's a contradiction in terms.) (Mummy Chief: Oh. Oh, this is great. She's got mummy issues, too. GET SOME THERAPY, PEOPLE! (to Tad) Take him here.) (As soon as he hears this, Max points one long fingernail at Tad.) Don't even THINK about it, Toad. (Tad, putting his foot down: My name...is TAD!) (As he speaks, Tad clamps his beefy hand around Max's neck and brings him to the Mummy Chief.) (Tad: What are you gonna do, kill him? Pretty pointless, if you think about it.) (The Mummy Chief waves his hands and the Inca City is revealed in all its glory. As two guards approach, Max's jaw drops in shock.) (Professor Lavrof: Oh, my God. The treasure of the Incas! It exists!) (Mummy Chief, to the guards: Take him to our darkest cell. (to Max) You'll enjoy Eternal Jail.) What?! No. No! (The guards seize him by both arms.) Who do you think you're talking to? You can't do that! (The guards begin to drag Max away.) I'm Max Mordon! I'm the most famous archaeologist in the world! No! No! NOOOOOOOOOOOO!!!"

- Max Mordon defeated by the power of the Golden Idol. "(Morgana has finally achieved the power of the trident and is gloating with evil triumph. She laughs.) It's over, Triton. I sentence you to OBLIVION! (Suddenly, Melody leaps out of hiding and grabs the trident!) You! Just what do you think you're going to do with THAT? (Melody points the base of the trident at Morgana.) (Melody: Stay back!) (Morgana, with a laugh: Wrong end, sweetheart.) (Suddenly, the wicked witch grabs Melody by the leg, but the fearless heroine brings down the point of the trident, stabbing Morgana in the tentacle. The villain howls in pain.) (Melody: Grandfather? I think this belongs to you!) (Melody tosses the trident to King Triton.) NOOOOOO! (Morgana's arm pushes Melody, who tumbles over the edge of the ice pedestal, but Dash jumps underneath the girl, causing her to land on him like a pillow. The trident lands in Triton's hand, and he raises it above his head.) (King Triton: Never again will you or yours threaten my family!) (Morgana tries to shield herself with her tentacles, but it's too late.) (King Triton, firing a ray at Morgana: There will be no escape for you...EVER!) (Morgana gives out a horrible cry as the trident's power imprisons her in a huge iceberg. The pedestal crumbles into pieces and falls into the ocean. Morgana, held prisoner in the ice, sinks to the bottom of the sea.) Mommy!"

- Morgana defeated by the power of the trident.