Answering to a distress call, teams of space marines descend into a mine on another planet. There, they must rescue captured miners, avoid the mysterious Shanalgar and fight a terrible alien species of unknown origin: the Zagorgs. Each player controls a team of two marines, a Shanalgar "knight" and, to hinder the other players, a constantly renewed supply of Zagorgs. The players score points by rescuing miners, healing other players' wounded marines and, of course, killing Zagorgs. The game ends when the last miner is safe.