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However, he became one of the MCU's most dangerous and complex villains when his programming went awry. Despite his significance to the franchise, other villains often overshadow Ultron, who remains one of the most intriguing and underrated antagonists in the MCU. This complex motivation adds depth to his character, making him one of the MCU's most interesting and complex villains. A terrifying villainUltron, a formidable foe with unparalleled strength and intelligence (Image via Marvel Studios)Ultron is a genuinely terrifying villain in the Marvel Cinematic Universe. This adds a layer of complexity to the Marvel villain, making him even more fascinating.