John Carpenter's Toxic Commando

In the near future, an experimental attempt to harness the power of the Earth’s core ends in a terrifying disaster: the release of the Sludge God. This eldritch abomination begins terraforming the area, turning soil to scum and the living to undead monsters. Luckily, the genius behind the experiment has a plan to make things right. All he needs is a team of competent, highly trained mercenaries to get the job done.