Mercury (element)


 * For the planet of the same name, see Mercury.

Mercury is a chemical element required for the proper functioning of the TARDIS' fluid links. The Doctor falsely claimed that a fluid link had run out of mercury as a ruse to explore the Dalek City. (DW: The Daleks)

Years later, the mercury in the fluid links evaporated, forcing the Doctor and Jamie McCrimmon to evacuate the TARDIS. (DW: The Wheel in Space)

The planet Vulcan had pools of fuming mercury on its surface. (DW: The Power of the Daleks)