The Invisible Enemy: Part One
- Episode aired Oct 1, 1977
- TV-PG
- 23m
In the year 5000 AD a three-man crew arrive on the planet Titan but unknowingly become hosts for an alien virus that turns them hostile. Picking up a distress signal in the Tardis, the Docto... Read allIn the year 5000 AD a three-man crew arrive on the planet Titan but unknowingly become hosts for an alien virus that turns them hostile. Picking up a distress signal in the Tardis, the Doctor and Leela head to the planet to investigate.In the year 5000 AD a three-man crew arrive on the planet Titan but unknowingly become hosts for an alien virus that turns them hostile. Picking up a distress signal in the Tardis, the Doctor and Leela head to the planet to investigate.