Star Trek: The Next Generation (1987)

S01E17 Home Soil

Stardate: 41463.9. An away team from the USS Enterprise embarks on a mission to probe the mysterious death of an engineer on a desolate planet. During their investigation, they unexpectedly confront hostile microscopic organisms that exhibit a fierce desire for vengeance. As the crew navigates this perilous situation, they must unravel the mystery behind these tiny but formidable life forms to ensure their own survival.