To Tell the Truth

There are a significant number of people living on a planet where the biology has been controlled. Earth is overpopulated and under control of a very strict government. This is the hope of the future. Gregory Harrison plays a botanist who has been instrumental in the success of this project. He is also looked at with disdain because at one time he predicted a catastrophe and it didn't happen. Now, in running simulations, he has recognized that if everyone doesn't evacuate the settlement, they will be destroyed by predictable forces having to do with the sun. Of course, because of the previous mistake, no one will believe him. Evacuation will bring financial ruin. It will also set the project so far back, it will never be renewed. There are other factors. One is that in a kind of Native American purge, the colonists destroyed the alien culture, but it is suspected there may still be a presence which would move in if they left. An overzealous man who wants control, leads the people in opposition to the botanist, even accusing of being an alien himself. He has a little fascist group that supports him. Things play out nicely a rather depressing, but excellent, episode.