It would be a huge missed opportunity is this isn’t a needle drop during the movie or when the credits roll. Hand of Doom (2012 - Remaster) by Black Sabbath.

It’s on the same damn album as Black Sabbath’s Iron Man, which played when the credits rolled after Tony announces that he is Iron Man in his first film. The parallel would be chilling, and the lyrics and instrumentation feel right for an foreboding and ominous character theme. It’s a strikingly cinematic song: so many sections in this song can be used in different ways throughout the film. That simple bass motif is so badass and could easily be his underlying theme.