Following a disastrous initial invasion, Sergeant Stark, the titular hero of the series, seizes control of the American military forces on the Moon.
After the initial invasion of the Moon succeeds in results in seizure of the Lunar colony, Sergeant Stark is forced to serve under several incompetent commanders.
After turning down an offer to be promoted to officer status by the wily General, Stark finds himself in command of almost half of the American ground forces in existence, in a heavily fortified position on the Moon, in a de facto rebellion against the US and Earth.
After repelling a major US offensive, Stark begins to oversee the administrative aspects of his command, including negotiating with the Earth government, which amounts to little more than a demands for unconditional surrender.
The other major force are the corporations that attempt to lay claim to the Moon, through the puppets of the generals and the various political figures they are shown to own through thinly veiled bribes in the form of campaign contributions.