Star Trek: Voyager Season 4 Episode 24

Stardate: Unknown. In search of the vital chemical deuterium essential to Voyager’s energy supplies, they discover a ‘Demon’ planet with reserves large enough to replenish the ship. Ensign Kim and Tom Paris take a shuttlecraft down to the planet’s surface in environmental suits. Soon they are found on the planet with no suits, and the ship’s atmosphere becomes poisonous to them.