You were able to sneak into the lab unnoticed and have the element of surprise. Your mission is to eliminate all of the scientists and let none of them escape. Remember you are a grunt after all. It's time to go postal once again. There will be no Xen or displacer in Retaliation.
Action is the main theme.
It will mainly be an encounter against military targets, but there is a healthy dose of aliens too. There will also be many sequences and a few puzzles to keep things interesting. Retaliation is the last of this series. This story takes place after the events in Dark Operations. You, Adrian Shephard and your buddies are traveling in an Osprey on the trip home to the Santego Military Base in Arizona.