SAS Zombie Assault 4 Multiplayer Quick Match Onslaught HD

Aboard the Kurios Space Control Station in Thera System, an unknown virus has infected most, if not, all humans. At Bay 10, Military Space Shuttle Mantis 12 is unable to leave due to malfunctioning ramps. As a result a team of SAS forces begins to defend the rear of the shuttle. Eventually, the SAS manages to takeoff, but not before being attack by a mutated boss zombie, which in-game, changes depending on your character level. When the SAS finishes clearing the shuttle, it departs.

Meanwhile, upon hearing of the news about the virus, dubbed the Thera Virus, the president begins to address worried citizens that all will be taken care of. While on TV, an intelligence officer orders the same SAS team from the Aartis system to recover a vaccine on Thera discovered by Combot, an AI designed for emergency defense, in order to stop an outbreak on Aartis, one of the known planets where the human race resides. Since the president's address to the people, he has also approved of signaling the Jolt Ship in Thera's orbit to fire its WMD to destroy the entire planet, since there were no signs of life at the time. The team has only less than 15 minutes to retrieve the vaccine and get out alive before they are destroyed along with Thera. The team of SAS fights their way through a subway station to reach a train, which leads to a lab containing the Vaccine. Once they retrieve the Vaccine, the team manages to shoot their way through a crowded street filled with all sorts of zombies, including another mutated boss zombie(s).

After retrieving the vaccine, the SAS Team boards a dropship and departs. A few moments after the SAS Team departs, the Jolt Ship destroyed the planet, killing all the zombies on it. Combot then orders the team back to Aartis System since the virus has reached a heavily populated planet of Aartis. There, citizens have barricaded themselves in, but they won't last long with the hordes of zombies abound. The SAS are then ordered by ComBot to rescue as many survivors as possible and neutralize any zombies in the area, including survivors who become infected. After rescuing any survivors in the area, the SAS are attacked by another boss zombie.

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