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The Halo Announcement Trailer was the trailer that first unveiled Halo: Combat Evolved to the public in 1999. It was created when Halo was still destined to be third person shooter for the Mac and PC, a demo run in realtime on a Power Mac G3 with Rage 128. The version of Halo shown in the trailer differs heavily from the final game, but some of the core elements, like SPARTAN-II supersoldiers, Elites, the Warthog, Ghosts, Banshees and many weapons, were already in. The music played in the trailer is the Halo Theme.
The trailer begins with a Spartan-II in an early version of Installation 04's control room, seemingly doing some operations with The Core. He then runs away, and ends up in a hangar with a few Banshees and two Elites with Energy Swords. He taunts the Elites, and runs through some Forerunner corridors as they chase him. He exits into an open hilly area, with a Warthog and two other Spartans, one of them is firing an Assault Rifle. Gesturing with his hands, all three Spartans then jump into the Warthog and drive across the hills, the Elites unable to catch the vehicle.
As the Warthog drives through the hills, two Elites spot it and give chase with their Ghosts. The Warthog opens fire with its chaingun and manages to flip one Ghost over, after which the other gives up. The Warthog then stops and the Spartans disembark, spotting a Banshee guarded by two Elites down in a valley. One of the Spartans jumps into the Warthog and drives past the Elites, distracting them.
The second Spartan jumps behind the Plasma Rifle-wielding Elite and points a Pistol at his head, making the Elite surrender. The third one makes a run for the Banshee and takes off, avoiding blasts from the second Elite's Fuel Rod Gun. The Banshee flies across the landscape, and another Spartan is seen atop a tall hill, waving a Bungie flag.