 
Zombies: AVP 4
After the cargo plane lands, not all the aliens have been destroyed. There are still many of them on the plane in which hid during the flight. The four then run into the base and the aliens follow. This map takes place in a CIA base. You start off on the first floor, then make your way up using elevators and staircases. Also, instead of facehuggers in this map, there are now chestbursters.
Boss Round:
The boss round on this map is the Predalien. It is an Alien Predator hybrid and is the strongest enemy yet in this story line. It can use claws, teeth, and blades to down you.
Power-Ups and Perks:
Insta-kill
Double Pints
Death Machine
Nuke
Juggernog X (Take more damage before being downed.)
Speed Revive (Revive quickly)
Triple Tap (Higher rate of fire)
Extreme Fast (Slight of hand)
Spy-eye (Lets you have a UAV)
Wonder Weapons:
Leichenfaust 44
Storm Thrower
Particle Cannon
Wall guns:
MP5K
Winchester 1887
FAL
Mini-Uzi
Vector
M93 Raffica
Weapons from the mystery Box:
AK-47
Scar-H
TAR-21
UMP .45
KRISS Super-V
RPD
M240
Ranger
AA-12
USP .45
Desert Eagle
Stinger
Intervention
Barret .50 Cal
Javelin