In the game you play as a United States marine who is air dropped onto a tropical island on a top secret mission to stop the evil Dr. Hellman who plans to release his army of zombies on the world. In the opening credits you become bitten by a zombie and meet your friends, an attractive female reporter and your male driver.
Most of the game play is similar to other shooting full motion video games such as Lethal Enforcers mixed in with full motion video clips. In the game you moved through the jungle shooting various zombies, collecting better ammo (to prepare for a raid on Hellman's compound) and medicine to help stall your transformation into a zombie.
Source: Wikipedia, "Corpse Killer", available under the CC-BY-SA License.