SAS4 Singleplayer Campaign

The singleplayer campaign of SAS: Zombie Assault 4 is based on a storyline, taking place about 1000 years from now. The setting is usually in Aartis, but some maps are set in other locations.

Onslaught
About 1000 years into the future, the zombie virus from Thera spreads to the Kurios Spaceport Control Station in teh Trans-system. The crew of Mantis 12 cannot take off because the ramps at Bay 10 are malfunctioning. The commander of the space station orders them to take off because a high-level biohazard had been detected in Bay 5 of the North Wing. Then, the virus spreads throughout the station. The zombies come in to the dropship at Bay 10, and the SAS are ordered to defend the ship before it takes off. When the ramps are finally repaired and the ship ready for takeoff, a giant mutated zombie (the boss) enters the ship, and the SAS must kill it before takeoff can commence.

Vaccine
A Jolt Ship has been sent into space to completely destroy Thera because it is lifeless and full of zombies. The Trans-system President confirms the strike, but Combot, an electronic system that controls all computers and robots on Aartis, states that the infection has spread to Aartis. It had located a vaccine, but the orbital strike was already confirmed and cannot be shutdown, because the countdown had reached 30 minutes. Then, the SAs have been sent there to retrieve the vaccine before the bombardment commences. Then, the dropship takes them back to Aartis.

Survivors
The virus had spread to Aartis and infected most people. Some survivors have barricaded themselves in their homes and shops, but the SAS must rescue them all. After they were evacuated, a large mutated zombie attacks them (boss). Then, the SAS finally defeated the zombies in the city. Combot guides the player around.

Zombie Pods
A new surprise shocked the Trans-system. A biological infection has also became a digital pathogen. Suddenly, the zombie virus attacked electronic equipment, including Combot. Machines have become pods and the SAS must defeat them at the market. In the parking garage, there are 4 minion pods and 1 boss pod.

VIP
A VIP has been invaded by zombies and is hiding in his home. Like Survivors, the SAS must save the VIP. There are Zombdroid Servants in the garden, and that is probably how the virus became a digital pathogen. The Zombdroids are robots covered in human skin.

Power Out
A hospital has lost power and the SAS must restore it through underground tunnels. As they turn on the switches, Infected Combot activates turrets and Loaderbots.

Last Stand
The last survivors from Aartis have been gathered at the market square ready for evacuation