Great theme! Here are some memorable movie villains whose quest for unstoppable powers ultimately led to their downfall:br br 1. **"Indiana Jones and the Last Crusade" (1989) - Walter Donovan**br Donovan’s greed for eternal life leads him to drink from the wrong Holy Grail, causing him to rapidly age and die in a horrifying sequence.br br 2. **"Avengers: Infinity War" (2018) - Thanos**br Thanos achieves ultimate power by collecting all six Infinity Stones and snapping half the universe out of existence, but his quest for power leads to his eventual defeat and demise in "Avengers: Endgame."br br 3. **"Star Wars: Episode III - Revenge of the Sith" (2005) - Anakin SkywalkerDarth Vader**br Anakin’s desire for power to save Padmé leads him to the dark side and transforms him into Darth Vader, resulting in personal tragedy and physical and emotional ruin.br br 4. **"The Mummy" (1999) - Imhotep**br Imhotep’s quest to resurrect his lover and achieve immortality ends in his downfall when he is rendered mortal and devoured by flesh-eating scarabs.br br 5. **"Lord of the Rings: The Fellowship of the Ring" (2001) - Sauron**br Sauron’s desire to dominate Middle-earth through the power of the One Ring ultimately leads to his downfall when the Ring is destroyed, eradicating his physical form.br br 6. **"Doctor Strange" (2016) - Kaecilius**br Kaecilius’ quest for immortality and power by tapping into Dormammu’s Dark Dimension ends in his defeat and eternal entrapment in the Dark Dimension.br br 7. **"Harry Potter and the Deathly Hallows – Part 2" (2011) - Voldemort**br Voldemort’s quest for immortality through Horcruxes leads to his downfall when Harry and his friends destroy the Horcruxes, making him vulnerable and ultimately leading to his death.br br 8. **"Spider-Man 3" (2007) - Eddie BrockVenom**br Eddie Brock’s desire for power through the Venom symbiote leads to his own destruction when he is consumed by the very entity that granted him power.br br 9. **"The Incredibles" (2004) - Syndrome**br Syndrome’s desire to become a super-powered hero results in his downfall when his technology turns against him, leading to his death.br br 10. **"The Matrix" (1999) - Agent Smith**br Agent Smith’s quest for ultimate power and freedom from the system leads to his self-destruction when Neo defeats him, restoring balance to the Matrix.br br These villains' quests for ultimate power not only provide thrilling narratives but also serve as cautionary tales about the dangers of unchecked ambition.