Some heroes are meant to save the day, but sometimes, they take a dark turn and become the very thing they once fought against. Whether driven by power, tragedy or pure madness, these characters started as protagonists only to shock audiences with their descent into villainy. Here are 15 movie heroes who made the unexpected leap to the dark side.
Anakin Skywalker, Darth Vader – Star Wars Prequel Trilogy, 1999-2005

Anakin Skywalker fell to the dark side in his desperation to save Padmé, once a promising Jedi and the “Chosen One.” Manipulated by Emperor Palpatine, he betrayed the Jedi Order, slaughtered younglings and became Darth Vader. His transformation is one of the most iconic and heartbreaking in cinema history.
Harvey Dent, Two Face – The Dark Knight, 2008

Gotham’s “White Knight” started as a symbol of justice, but after a tragic accident that left half his face burned, he succumbed to madness. Fueled by grief and Joker’s manipulation, he abandoned his principles and sought vengeance. His fall proved Joker’s point: even the noblest hero can be corrupted.
Jean Grey, Dark Phoenix – X-Men: The Last Stand, 2006 & Dark Phoenix, 2019

Jean Grey was a beloved X-Men member, but after unlocking her full telekinetic powers, she lost control and turned against her friends. Consumed by the Phoenix Force, she became a force of destruction, killing Cyclops and Professor X. Her story is a tragic tale of power overwhelming morality.
Jack Torrance (The Shining, 1980)

Jack started as a struggling writer and loving father, but the sinister Overlook Hotel twisted his mind. The haunted hotel preyed on his weaknesses, pushing him into madness until he tried to murder his own family. His chilling transformation from protective father to axe wielding maniac is legendary.
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T-800 Terminator 2: Judgment Day, 1991 – Alternate Future Version

While the reprogrammed T-800 became a hero, an alternate version of the Terminator was originally designed to wipe out humanity. The machine had no emotions, no regrets, just a mission to destroy. In some timelines, the T-800 remains an unstoppable villain, proving that heroes can be reprogrammed for evil.
Walter White, Breaking Bad 2008-2013, Though a TV Character, He is Too Iconic to Ignore

Walter White started as a struggling high school teacher with good intentions, but his descent into the drug world turned him into a ruthless kingpin. His transformation into Heisenberg made him one of the most compelling antiheroes in history. By the end, he had more in common with the villains he once opposed.
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Andrew Detmer – Chronicle, 2012

Andrew was a bullied teenager who, after gaining telekinetic abilities, initially used them for harmless fun. However, as his power grew, so did his anger, leading him to seek revenge on those who mistreated him. His story is a haunting example of how unchecked power can lead to destruction.
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Eleanor Shaw, Senator Iselin – The Manchurian Candidate, 1962 & 2004

Originally seen as a protective mother, Eleanor secretly conspired to turn her son into a political assassin. Her manipulative nature and betrayal shocked audiences as her sinister motives were revealed. She proved that even family members can become the ultimate villains.
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Loki, Thor, 2011 & The Avengers, 2012)

Loki was a misunderstood prince who longed for Odin’s approval but turned to villainy out of jealousy and rage. His schemes against Thor and Asgard led to catastrophic consequences, though he later found redemption. His journey from hero to villain and back again is one of the most complex in the MCU.
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Commodus – Gladiator, 2000

Born into royalty, Commodus was supposed to rule Rome with honor, but his jealousy of Maximus consumed him. He murdered his own father, seized the throne and became a corrupt, power hungry tyrant. His descent into madness was driven by his inferiority complex and desperate need for validation.
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Light Yagami, Death Note, 2006 – Anime, But Too Iconic to Exclude

Light started as a student with noble intentions, using the Death Note to rid the world of criminals. However, his god complex grew out of control, and he became a ruthless murderer who killed anyone who opposed him. His transformation from a justice-seeker to a tyrant is one of the most gripping in storytelling.
Severus Snape – Harry Potter Series, 2001-2011

Snape spent much of the series appearing as a villain, though ultimately revealed to be working for good. His complicated past and questionable actions made him one of the most morally ambiguous characters in the series. While he was not truly evil, his allegiance was always uncertain.
Denzel Washington’s Alonzo Harris – Training Day, 2001

Alonzo was a decorated LAPD detective, but his thirst for power and corruption turned him into a ruthless criminal. He manipulated his rookie partner, Ethan Hawke’s Jake Hoyt, into illegal activities before being exposed. His fall from grace showcased how absolute power corrupts absolutely.
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Syndrome – The Incredibles, 2004)

As a child, Buddy idolized Mr. Incredible, but after being rejected, he turned into the vengeful villain Syndrome. Using his intelligence, he devised a plan to wipe out superheroes and make himself the only “hero.” His transformation was driven by bitterness, proving that even admiration can turn into hatred.
Gollum, Sméagol – The Lord of the Rings Trilogy, 2001-2003

Sméagol was once an innocent hobbit, but the One Ring’s corruption turned him into the treacherous creature Gollum. His split personality showcased his internal struggle between good and evil, but in the end, his greed won. His tragic fall is one of the most powerful cautionary tales in fantasy cinema.
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Heroes do not always stay heroes, sometimes, the same qualities that makes them great can also lead to their downfall. Whether it is the thirst for power, manipulation or inner demons, these characters shocked audiences with their transformation into villains. Their stories serve as reminders that even the noblest of intentions can pave the way to darkness.
Disclaimer: This list is solely the author’s opinion based on research and publicly available information.
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