Trailer:

DESCRIPTION:

Halo 3: ODST

Plot

The game begins with Dutch (Adam Baldwin), Romeo (Nolan North), and Mickey (Alan Tudyk) discussing the Covenant ship above New Mombasa, with the Rookie asleep nearby. Buck (Nathan Fillion) arrives and introduces Dare (Tricia Helfer). Romeo wakes the Rookie and the team enter their HEVs and drop through the atmosphere; at the last minute, Dare changes their trajectory to miss the ship.The Covenant ship enters slipspace, sending a shockwave toward the ODSTs; the Rookie's pod collides with Mickey's and crashes into a building on the ground, knocking him unconscious for six hours. He awakens and proceeds to find clues as to what happened to his squadmates.

Buck makes a rough landing after the drop and fights through Covenant forces to find Dare. He finds Romeo instead, and the two resolve to find the others and get out of the city.Dutch drops near a nature preserve and helps Marines fighting there. Mickey commandeers a tank and fights his way along a Mombasa boulevard. Meeting up with Dutch, the two defend an ONI base from the Covenant, destroying the facility to keep it from being captured. They are evacuated by a transport and make contact with Buck, arranging a rendezvous at police headquarters, but are shot down. Buck and Romeo rescue Dutch and Mickey, but Romeo is seriously wounded. The squad hijacks a Covenantdropship, but instead of leaving the city, Buck decides to have them turn back and find Dare.

Back in the city, the Rookie is assisted by Virgil (the Superintendent), which leads him to Dare's position. The two reach the Superintendent's data core, which possesses information on something the Covenant is looking for underneath the city. Inside the core, they discover a Covenant Engineer. Dare explains that the Engineers are "biological supercomputers" that have been enslaved by the Covenant, and the one they found wishes to defect to the humans; with the Engineer's information on the Covenant combined with the Superintendent's data, Dare's mission changes from downloading the Superintendent's data to escorting the alien to safety. The Rookie, Dare, and the Engineer reunite with Buck and fight their way out of the city. As they fly away in the transport, the squad watches as Covenant ships destroy New Mombasa.

In the epilogue, one month after the events of the Campaign, the ODST squad has been keeping guard over the Engineer. Sergeant Major Avery Johnson arrives, informing the Engineer that he intends to ask it everything it knows about the Covenant—and what they are looking for—setting the stage for Halo 3. If the campaign is completed on the Legendary difficulty level, a scene shows the Prophet of Truth overseeing the excavation of a Forerunner artifact buried beneath the Superintendent's data core.

(From Wikipedia)

Gameplay(SINGLE-PLAYER):

Gameplay(MULTIPLAYER):