Aliens (music)

Aliens is the fourth track on Volume 2 of the Halo 4: Original Soundtrack.

Appearances
This soundtrack can be heard:
 * In Forerunner, when John-117 shuts down the first pylon.
 * In Spartan Ops Episode 9 introduction cutscene, Key, when the Librarian's imprint reveals the Janus Key to Catherine Halsey.