As John Williams celebrates his 90th birthday, recent scholarly literature has cataloged his motifs (Lehman 2018), "unraveled his creative processes" (Audissino 2021), and even birthed online courses based on his themes (Richards 2020). My research unites extant discourse with an analysis of salient features that epitomize "the dark side" -- those that evoke preeminent villains. My paper highlights three distinguishing features of Williams' villain motifs via antagonists from each decade of his oeuvre from 1980-2020: 1(R) a dotted rhythmic figure that leads into a metrical strong-beat, 2(M) a prominent _#4̂ in the melodic line, often paired with ₆̂ in a minor key, and 3(H) harmonic planing of minor triads. Furthermore, I reveal short recompositions to illustrate the changes in features and the corresponding effects. Ultimately, I hope that a clearer understanding of stylistic features can reveal artistic nuance palpable to several film audiences and theorists alike.