According to the Gathering of Doctors, the gene pool has become dangerously restricted and variation must be reintroduced to save the planet. The Senate has never seen eye to eye with the Doctors and bans them from implementing their ideas. Consequently the Doctors choose to secretly geo-engineer a planet to save the existing species from extinction. On reaching the newly created planet, the Doctors discover an animal with a close genetic match to themselves and proceed with their program to create a new hybrid. Everything appears to be going to plan until some of the ship's crew succumb to temptation and visit the planet surface. Horrifying events proceed to unfold and the Doctors are faced with a race against time to save the planet and its species before the military destroy everything.
