Imagine a war.  A war that has lasted centuries, a war which has transformed an entire planet into a desolate No Man's Land.  A war in which time itself is being used as a weapon.

You can create zones of decelerated time and bring the enemy troops to a standstill.  You can create storms of accelerated time and reduce the opposition to dust in a matter of seconds.

But now the war has reached a stalemate.  Neither the Plutocrats nor the Defaulters have made any gains for over a hundred years.

The Doctor, Fitz and Anji arrive at Isolation Station Forty, a military research establishment on the verge of a breakthrough.  A breakthrough that will change the entire course of the war.

They have found a way to send soldiers back in time.  But time travel is a primitive, unpredictable and dangerous business.  And not without its own sinister side effects...