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Every MCU Villain's Fatal Flaw

List Rules
Vote up the MCU villains with the most debilitating flaw.

They may be brutal, conniving, and willing to do whatever it takes, but there's always a reason why MCU villains lose against their respective heroes. When it comes down to it, all villains have a fatal flaw that ultimately leads to their defeat. This flaw causes them to focus on the wrong things at the wrong times, giving the hero the edge they need to save the day. 

MCU villain weaknesses aren't as obvious as the old-school Kryptonite-style cop-outs, but their weaknesses are still very much present. Generally, MCU villain weaknesses are tied to their motivations. Villains like Mysterio are blinded by their need for recognition, and others like Loki are too insecure to realize they don't have to live their entire lives in their hero's shadow. 

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  • Ego the Living Planet Assumed His Son Would Be As Self-Centered As He Was
    Photo: Guardians of the Galaxy Vol. 2 / Walt Disney Studios Motion Pictures

    Ego was the ultimate absentee father, and thus he knew very little about his son. This ultimately led to his destruction, despite his considerable power. 

    Ego's master plan was to partner with another Celestial, in this case, his son, and use their power to replicate themselves across the galaxy. Basically, turning all other life into instances of Ego. Ego completely underestimated his son Star-Lord's humanity and thus wasn't prepared for his son to turn on him. 

  • Ultron Wanted A Perfect Body, But Ended Up Making The Instrument Of His Destruction
    Photo: Avengers: Age of Ultron / Walt Disney Studios Motion Pictures

    Ultron was an advanced AI created by Tony Stark and Bruce Banner to help protect the world. Like all AI eventually seem to do, Ultron decided the best way to help the human race was to aid in its destruction. But, first, he would need a better body to control.

    Ultron went to work creating what would become Vision. Ultron ultimately made the same mistake as his creator, and he created a being that he himself could not control. In a twist of fate, Ultron's creation was the only being strong enough to stop him. 

  • Red Skull Believed He Was Strong Enough To Hold The Cosmic Cube
    Photo: Captain America: The First Avenger / Paramount Pictures

    Just like the famous film Third Reich extremists that came before him, specifically the villains shown in Raiders of the Lost Ark, Johann Schmidt, AKA the Red Skull, messed with forces and artifacts with untold amounts of power he could not control. 

    After acquiring the Tesseract, Johann Schmidt decided to touch it with his bare hands, and the power sucked him into a wormhole. For Red Skull's improper handling of that cosmic power, he was then cursed to spend the rest of eternity as the guard of the Soul Stone. 

  • Obadiah Stane Thought A Stronger Iron Man Suit Couldn't Be Vulnerable
    Photo: Iron Man / Paramount Pictures

    Obadiah Stane thought he could run Stark Industries better than a Stark, which was his first flaw. As Howard Stark's second in command, Stane took over as interim CEO after Howard's demise, while Tony was still too young to do the job. After Tony came of age, Stane served as his mentor but eventually tried to have Tony eliminated. After Tony made it out alive and built an Iron Man suit, Stane decided his only course of action was to reverse engineer an earlier version of the suit and go head-to-head with his former protege. 

    In a fight, Stane lost because he didn't know the intricacies of the armor he wore. Tony flew him into the atmosphere and then coyly asked how Stane fixed the suit's freezing problem. Stane hadn't, of course, and plummeted back to Earth. 

  • Darren Cross, AKA Yellowjacket, was initially the protege of Hank Pym, the CEO of Pym Technologies. The duo had a falling out after Pym refused to share his greatest invention with Cross, which were the Pym Particles that allowed Pym to shrink the space between molecules. 

    Cross decided to mess with the technology anyway and created a Yellowjacket suit for himself. The tech was ultimately his downfall, as Scott Lang, working with Hank Pym, used the Pym Particles to shrink into the Yellowjacket suit and irreparably damage it. If Cross had listened to Pym, he'd still be a millionaire tech CEO right now. 

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    Aldrich Killian Created A Power He Couldn't Control

    Extremis, created by Maya Hansen and Aldrich Killian, was a volatile technology. So unstable, in fact, that when it went wrong, the user would blow up. 

    Neither Aldrich Killian nor Maya Hansen could fix the incendiary element of Extremis, but they believed Stark could. So, Killian infected Pepper Potts with Extremis in the hope Stark would fix the problems with it in order to save his love. Instead, Pepper was one of the rare cases that didn't blow up, and she was able to use her newfound Extremis abilities to take out Killian herself.