A colony's mass insanity leads the Enterprise to a parasitic flying creature that clamps onto its victims' nerves and drives them to violence, and Spock is among those infected as the crew races a cure before the plague spreads to every world it has touched.
Summary by Loreful, from public sources
Placement
- Star Trek Original TV Series Adaptations
- contained in Star Trek 2collection
- contained in The Classic Episodes 1collection
- contained in The Star Trek Readeromnibus