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Hydrogen was the most common element in the universe. A hydrogen in-rush was a crucial part of Event One. (TV: Castrovalva)
The Fourth Doctor suggested energising hydrogen as an alternative power source to the "mineral slime" oil. (TV: Terror of the Zygons)
Hydrogen could also be used as a base in the process to form huon particles. (TV: The Runaway Bride)
The R101 was filled with hydrogen gas. (AUDIO: Storm Warning)
