Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.


You may be looking for petrol, also known as gas.

Gas was a state of matter.

Earth at an early stage of its development was an enormous mass of superhot gases surrounding a core of molten rock. Over millions of years, the sun "eroded away" the gases, causing the planet to solidify. (AUDIO: Exploration Earth)

The Twelfth Doctor claimed to know of a race made of sentient gas who threw fireballs as a "friendly wave". (TV: Flatline)

The Doctor was susceptible to gases in the praxis range. (TV: The Caves of Androzani, et al.)

The Empty Child plague caused gas masks to be fused to the skin of people's faces. (TV: The Empty Child)

The Zircon planned to wipe out the population of Earth using a galactic cyclone created by the destruction of a dying planet. By the time it approached Earth, it was a cloud of poison gas. (COMIC: Doomcloud)

In the early 21st century, caesofine gas was released into the Earth's atmosphere by ATMOS. (TV: The Sontaran Stratagem / The Poison Sky)

The Gelth were made of gas. When a human body decomposed, they produced gas, and the Gelth used this fact to use the corpses of Charles Dickens' driver and his coach as vehicles. (TV: The Unquiet Dead)