You are a marine sent to a part of South America to investigate a mysterious temple where people have disappeared. Also a few marines that were sent in before you never came out. The last report from a marine says that there were lizard type beings walking around. Also there are reports that they are working with other creatures in the jungle. Be on your guard marine or you'll be the next meal to these creatures!
id Software, Epic Games, Monolith, Raven, anyone who deserves credit (You know who you are), WildWeasel and Cory Whittle for weapons, Lil' White Mouse for music from Chosen and the guys who made RUINBROS.wad for the textures. (If I forgot anyone, I credit you, too)