In order to decide on new proposals for dealing with the dangers of pollution on the environment, Doctor Quist assembles a conference amongst the world's top scientists. But soon several of the delegates become ill, apparently from food-poisoning. However, Quist becomes suspicious, and suspects that the sickness may have been caused deliberately.
Did You Know?
There is currently no known copy of this edition in existence. The episode was wiped by the BBC at some point before the corporation audited its archives in 1978. See more