After detecting a distress signal, Galsec colonists head to Earth. But their ship malfunctions in orbit and crashes on the surface of the deserted planet. A small spherical object appears in the afternoon sky and slowly descends to the ground.
After struggling from the wreckage of their ship, the colonists see a Communication device nestled amongst the rocks. In front of it stands a Sontaran warrior.
Suddenly a mechanical sound is heard and before they can escape the four surviving colonists are entangled within metal tendrils.
The colonists are dragged to rocky outcrops from where Field Marshal Styre will begin the Sontaran Experiment!