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Hydrogen cyanide, also known as HCN and prussic acid, was a chemical compound.
On the Sense Sphere, the First Doctor used a syringe of prussic acid to kill a Zilgan. (PROSE: The Monsters from Earth [+]Loading...["The Monsters from Earth (short story)"])
Mehendri Solon kept Morbius' brain alive using hydrogen cyanide as a colloidal nutrient. The Fourth Doctor used hydrogen cyanide to create cyanide gas in an attempt to kill Solon and Morbius. (TV: The Brain of Morbius [+]Loading...["The Brain of Morbius (TV story)"])
Catherine's cat was poisoned by accidental exposure to prussic acid. (PROSE: Lackaday Express [+]Loading...["Lackaday Express (short story)"])
Hydrogen cyanide composed 9% of the 456 atmosphere. (TV: Children of Earth: Day Two [+]Loading...["Children of Earth: Day Two (TV story)"])
Zyklon B was a form of hydrogen cyanide. (AUDIO: The Nemonite Invasion [+]Loading...["The Nemonite Invasion (audio story)"])