If want to play as zombie and fight agains and interstelar alien then try Martian Zombie Survival in the great fps sci fi with option to play in 2 mods and fun. Enjoy!
*WASD* - move *down*, *up*, *left*, *right* or *arrows* - move *mouse* - look around *space* - jump *shift* - run *0*..*9* - change guns
Kikke
Crowd
Fores
Alien
Monst
Ice-c
Susun
Auto
Airpo
Off R
Fresh
Puzzl
Donut
Weeke
Pool
Secre
Sudok
Amgel
Becom
Hyper
Shark
Bus S
Milli
Save
Dalgo
Kingd
Block
Right
Squid
Idle
Sky C
Unico
Rescu