Classic Headcrab

Fast Headcrab

Black Headcrab

Classic Zombie

Fast Zombie

Posion Zombie

Barnacle

Ant Lion

Ant Lion Guard

Metro Cop

Combine Soldier

Combine Elite

Combine Strider

Combine Gunship

Combine Dropship

Scanner

Rollermines

Manhack

Combine Armoured Personnel Carrier (APC)

Combine Helicopter