The Half Life Expansion texture pack replaces several mob textures with characters/mobs from the Half Life game. Here's a list of changes :

-Houndeye = Creeper

-Alien Controller = Ghast

-Headcrab Zombie = Zombie

-Snark = Silverfish

-Chumtoad = Endermite

-Vortigaunt = Skeleton

-Alien Grunt = Wither Skeleton

- Antlion Soldier, Worker, Grub

- Metro Cop/CP

- Combine Soldier

- Shock Trooper

- Bullsquid

- Poison Headcrab Zombie

- Leech

- Manhack

- Crab Synth = Ravager

- City scanner = Bee

- DOG = Iron golem

- Hunter = Evoker

- Floating Flocker = Blaze

- Combine Assasin = Witch

- Stray = Stalker

Take a look at the screenshots to see what you can expect from this pack. Download links are given below. Read the installation instructions carefully.

newest

fresh

relevant

playable

legacy

Half-Life Expansion Texture Pack