Space capsule (The Power of the Daleks)

A space capsule crewed by three silver Daleks crash landed in the mercury swamp of the planet Vulcan. (TV: The Power of the Daleks)

History
In a transmission recovered and recorded in The Dalek Conquests, the capsule was on a course which entailed traversing the orbital path of the planet Vulcan when its engines were hit by a meteor strike, disabling maneuvering controls. As a result, the capsule was caught in Vulcan's gravitational pull. Though the Dalek crew attempted to transmit a distress signal to their home planet, Skaro, they found that their transmitter was non-functional as main power shut down, leading to a crash landing on Vulcan. (AUDIO: The Dalek Conquests)

Two hundred years later, a human colony had been established on the planet Vulcan. The Daleks were found in their space capsule underground and then reactivated by a scientist called Lesterson. This overlapped with the rebellion against Hensell led by Bragen. The rebellion failed after the Daleks began an indiscriminate slaughter of the colonists but the Second Doctor overloaded their temporary static circuit from the colony's electricity supply. (TV: The Power of the Daleks)