Star Trek: Voyager

Demon (4x24)

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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.