Deeper into the base, Crispy and Ramirez are both ambushed by the Theta and killed, leaving Cole on his own. HAZMAT Team Bravo, composed of team leader Ramirez, McCan, Crispy, and mission specialist Ethan Cole ( David Duchovny) is sent to find Delta.ДЄfter initially encountering the mutants, McCan is killed when a mutant decapitates him. HAZMAT Team Delta, the first team initially sent into Area 51 are ambushed by the 'Theta' creature, sustaining casualties, before withdrawing deeper into the base. This prompted the military to send in a Quick Reaction Force led by Major Bridges ( Powers Boothe) to quarantine and contain the virus. Winston Cray ( Ian Abercrombie) found out about the plan, he let loose the 'Theta' and the mutagenic virus throughout Area 51, in an effort to slow them down. Unbeknownst to many of the scientists working on the project, the Greys and the Illuminati were also planning to use the virus against the Earth population and dominate the planet. The Greys and the human scientists eventually developed a powerful alien being - known as the 'Theta', which spread the virus. The Illuminati used some of this technology to spy on the population. In return the Greys would give the Illuminati exclusive access to Grey technology. The Illuminati would give the Greys a research base 3 miles below the surface of Area 51, the use of the base as a landing site, and give them human test subjects where they, along with human scientists, would research a mutagenic virus to use in a war on their homeworld. White ( Phil Proctor), and struck a deal with them. Eventually, the Greys opened a dialogue with the Illuminati led by the ominous Mr. Air Force and taken to Area 51 in Nevada, where the lone survivor of the crash, a powerful Grey named Edgar ( Marilyn Manson), was held captive by the U.S. In July 1947, an alien spacecraft crashed near Roswell, New Mexico in the United States. Items which are scanned are viewable in-game, providing insight into the workings of Area 51, as well as proving necessary to unlocking secret videos made by Dr. The HUD shows red when the player is very close, and blue when very far.

The scanner can collect information from the items without it being touched. This bar indicates how near or far a player is, to one of many scannable clues, such as file folders or personal digital assistants. The scanner, when equipped, adds a translucent bar to the player's HUD, which changes in color and height from light blue, to deep red. Scanning provides detailed information on a player's surroundings, as well as combated enemies. While using a scanner, the player has no access to weapons, and must switch to an available weapon in order to fight (though they could still melee).

This is possible by using the scanner present on the player's suit, worn throughout the game. Players can replenish health and mutagen either through the use of medical syringes found throughout the game or by using parasites, and mutagen by melee combat or 'using' infected corpses, or by finding mutagen syringes.ДЄ notable aspect of gameplay is the ability to scan and analyze various objects in the game environment. While in a mutant form, players can easily spot enemies, which would otherwise be cloaked to the regular human eye, albeit with a slight ocular defect. Mutating offers a variety of benefits, such as increased strength, stamina, as well as the initial ability to fire health-replenishing parasites as well as the later ability to contaminate enemies, both at the cost of mutation time reduction. Midway through the game, Ethan Cole becomes infected with the mutagen, and the option to turn into a mutant temporarily is obtained. The player can also use explosive grenades.

Each weapon has two modes of firing, the first being the primary method, while the second is of a much higher power level, at the cost of ammunition and accuracy to the player. Each weapon can also be used as a melee weapon for close quarter combat. Most weapons can only be wielded one handed, however the player can dual wield some weapons, such as the Shotgun and the Sub-Machine Gun. Throughout the game, the player uses a variety of weapons, both human and alien in origin, to defeat their adversaries. The game features operable machinery, including artillery turrets, besides the player's inventory of weapons. Area 51 is a first-person shooter, played from the perspective of the protagonist, Ethan Cole.

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