The war on the Epsilon ended in victory. However, the enemies blew up bombs containing a toxin that killed many inhabitants - it would take about a month for the machines to remove the toxin.

The ruler of Epsilon turned for help to ruler of a nearby planet - Castor. Their planets had a history of war, but now they were at peace. Castor and his people did not like the Epsilonians because of their past, but as a good ruler, he agreed to allow the Epsilonians to come to their planet...