24 wouldn't be the renowned show it is without the array of villains challenging Jack Bauer's every move. While some villains fade into obscurity, others leave a lasting impression, enhancing the overall viewing experience of the series. From the shocking betrayal of Nina Myers, whose actions serve as a turning point in the series, to the cunning and ruthless Habib Marwan, who masterminds multiple plots throughout a single season, 24's villains are diverse and memorable.