Vulcan (Invasion of the Daleks)

Vulcan was a planet which supported a Human colony. It was roughly 12 parsecs away from any other colony. The atmosphere was breathable by Humans, there was very little radiation and the average temperature was 30 degrees Celsius. It was a young, volcanic world, rich in nutrient-rich soil, but with no native life. It did have pools of fuming mercury. Vulcan's day was just a few hours shorter than Earth's.

Vulcan was colonised after the Humans discovered the mineral riches found on the planet. It was the third such colony made. The Human colony was almost taken over by Daleks who had been reactivated by a scientist called Lesterson after being found in a crashed space rocket. (DW: The Power of the Daleks)