There is a strict prohibition against travel into the past, because of its potentially disastrous effects on the timestream and the catastrophic consequences for current civilization.

Zeke S. Vettenmyer, a Lieutenant in the Temporal Corps, has stolen an interkron, traveled back into the past, and subtly altered historical situations so that the outcomes of these events will be changed.

You must pursue Vettenmyer across 3,000 years of history, going to the times and places he has visited and reversing the changes he has made which are currently threatening the future that defines your very existence.

Famous locations that appear in the game include Lake Texcoco, Teotihuacan, Tenochtitlan, Stonehenge, Runnymede, the Cliffs of Dover, the Circus Maximus, St. Peter's Basilica, the Palazzo Braschi, the Great Pyramids, the Nile River, the Hanging Gardens of Babylon, the Forbidden City and the Great Wall of China.

The main puzzle at the end of the game involves travelling quickly back and forth through time while interacting with versions of your past and future selves.