Oil was a substance found on some worlds, sometimes mined as a source of energy. The Fourth Doctor complained that being dependent on "mineral slime" did not make sense, suggesting the energising of hydrogen as an alternative. (TV: Terror of the Zygons)

In 2700 BC Mesopotamia, the Seventh Doctor speculated that Ishtar could use the vast oil fields under the region as a power source in her plans to take over Earth. (PROSE: Timewyrm: Genesys)

Oil was found in East Ridge, Texas. Oilman John Glassman tried, and failed, to convince Thomas Watson to sell his land. (PROSE: The Farmer's Story)

The Nestene Consciousness thrived on worlds with much oil, as well as plastics, smoke and pollution. (TV: Rose)

In 1215, the Fifth Doctor was almost boiled in oil. (TV: The King's Demons)

Shaun Brett's father became wealthy from drilling for oil in Alaska. (AUDIO: The Land of the Dead)

Greg Sutton was an expert in the field of oil drilling. (TV: Inferno)

Global Chemicals developed an oil refining process which produced 25 percent more fuel. They also claimed that the process would not cause any waste or pollution, but this turned out to be untrue. (TV: The Green Death)

During the late 20th century drilling of oil off the cost of Scotland started by several companies, including Hibernian Oil. Four oil rigs off the coast of Scotland were destroyed by the Zygons. (TV: Terror of the Zygons)

An "oil apocalypse" occurred on Earth during the forty years of chaos up to 2059. (TV: The Waters of Mars) Despite that, oil was still available in 2119. (TV: Under the Lake)

On Venus, the Daleks forced their slaves to drill for oil. They put Mary Stone to work at an oil well which was later liberated by Jeff and Andy Stone. (COMIC: The Oil Well)

Oils from Halalala 7 were sold at Primo Temp. (COMIC: Buying Time)

By the 40th century humans were still drilling for oil, despite the Earth being depleted. Companies like Oil Corp would use mecha oil rigs to drill for oil on distant worlds like Boukon. (TV: The Infinite Quest)

Some kind of sentient oil was left behind by a spacecraft in Bristol. It mimicked people, one of them being Heather, who the puddle of oil took control of as a pilot for it. It was able to travel in time and space. (TV: The Pilot)

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