January 1999: The Zeus Project makes its first manned flight to Mars. Its ultimate goal: colonisation. On Mars, Ylla dreams of the coming astronauts and her husband, Mr K, plots their doom...

The second expeditions lands and finds a Mars a deceptively familiar but deadly home from home.

Finally, Col. Wilder's Zeus III expedition arrives to find the Martians dead, wiped out by chicken pox. For one crew member, Spender, the thought of Earth culture tearing the planet apart is too much to bear.