Grey Dalek

Grey Daleks (PROSE: Remembrance of the Daleks) were the basic Daleks, beginning with the first Mark III Travel Machines unveiled by Davros. (TV: Genesis of the Daleks) They served throughout the bulk of the Daleks' history prior to the Last Great Time War. (TV: Destiny of the Daleks et al.) During the Imperial-Renegade Dalek Civil War, they were classed as Renegade Daleks, loyal to the Supreme Dalek and opposed to the white Imperial Daleks loyal to Davros. (TV: Remembrance of the Daleks)

History
On Skaro, during the creation of the Daleks, the first Mark III Travel Machines which Davros presented to the Kaled Scientific Elite were grey. The newly christened Daleks were sent by Davros to exterminate the Thals, supposedly in retaliation for the attack on the Kaled Dome. They turned on Davros, as they were not programmed to recognise any creature as superior to them, apparently killing him. Accidentally, whilst attempting to stop the Fourth Doctor, a Dalek triggered an explosion which destroyed the embryo room before the Thals sealed the bunker entrance and trapped the Daleks there. In the aftermath, the Doctor believed he had only held back their progress by about a thousand years or so, and that they would return. (TV: Genesis of the Daleks)

Grey Daleks, led by a Gold Dalek, invaded Earth in an alternate 22nd century after the World Peace Conference was destroyed by Shura from the future. World War III started as various global factions accused each other of having done so. They used Ogrons as enforcers. The Third Doctor and Jo Grant travelled to 1970s and undid that alternate timeline. Shura used the bomb to destroy the Daleks and Ogrons in the Auderly House. (TV: Day of the Daleks) One account claims a Black Dalek was present as a second-in-command and was responsible for much of the Gold Dalek's tasks while the Gold Dalek acted as an overseer. (PROSE: Doctor Who and the Day of the Daleks)

The Daleks allied with to undermine the Earth and Draconian Empires and set them against each other and then take over with a huge army assembled on Spiridon. (TV: Frontier in Space) Despite the Master's failure to cause war, the army was prepared and the Daleks looked toward utilising the invisibility properties of Spiridon's inhabitants as a means of developing stealth technology. However, all of these plans were foiled when the grey Dalek army was frozen by the Third Doctor and a taskforce of Thals. (TV: Planet of the Daleks)

Grey Daleks fought in a war against the Movellans, (TV: Destiny of the Daleks) as did later Bronze Daleks. (TV: The Pilot) The conflict soon resulted in a stalemate: each side's purely logical battle computer kept them in deadlock. To circumvent this stalemate, the Daleks returned to Skaro to find Davros so his biological mind could reprogram their battle computers to win the war. However, the Fourth Doctor defeated them and the Movellans and Davros was taken by the Daleks' former slaves to stand trial. (TV: Destiny of the Daleks) The war continued for another 90 years, until the Movellans developed a Movellan virus to defeat the Daleks. (TV: Resurrection of the Daleks)

A grey Dalek was time scooped to the Death Zone on Gallifrey, where it tried to exterminate the First Doctor and Susan Foreman, only to be destroyed when they pushed it into a dead end, causing its energy weapon to ricochet and destroy it. (TV: The Five Doctors)

A detachment of grey Daleks led by a black Supreme Dalek went to free their creator to find a cure for the Movellan virus. They also used a time corridor and a Dalek duplicate called Stien to trap the Fifth Doctor to duplicate him and his Companions to assassinate the Time Lord High Council. However, the Doctor broke free of the duplication apparatus and turned Stien to his cause. Meanwhile, Davros turned several Dalek Troopers and two Daleks to his cause but the Supreme's Daleks destroyed the rebels. Both Davros and the Doctor unleashed the virus and the Dalek ship was destroyed by Stien. (TV: Resurrection of the Daleks)

Davros escaped to Necros and began to turn intelligent cryogenically frozen people into Imperial Daleks to conquer the universe. However, Takis called the Renegade Daleks to take Davros to stand trial. The Renegades fought their way past the Imperials to take Davros. He tried to get them to take the Sixth Doctor, but they did not recognise him. The Renegades' attempt to recondition the Imperials failed because of the Imperials' destruction by the Doctor and Orcini. (TV: Revelation of the Daleks)

The Renegade and Imperial Daleks both headed to Earth in 1963 to claim the Hand of Omega, waging a lengthy battle at Shoreditch. Aided by the Special Weapons Dalek, the Imperial Daleks won, almost wiping out the Renegades aside from the Supreme, who later self-destructed after the Seventh Doctor manipulated the Imperials into destroying Skaro. (TV: Remembrance of the Daleks)

In a vision of his future, the Eighth Doctor saw "a conical robot, gunmetal-grey" which swung a camera eye at him with the lights on the top of its head flashing angrily. (PROSE: Father Time)

Looking into his future via the Tomorrow Window, the Eighth Doctor saw "squat machines in gunmetal grey" gliding through the rubble of a ruined city beneath a flying saucer, their eyestalks scanning from left to right. (PROSE: The Tomorrow Windows)

Some Grey Daleks survived encounters with the Doctor and were classed as insane and taken to the Dalek Asylum. The insane Daleks died when the asylum was destroyed by the Parliament of the Daleks. (TV: Asylum of the Daleks)

Other references
A grey Dalek was among the foes whom the Fourth Doctor saw call out to him in his mind shortly before his fall from the Pharos Project radio telescope, which resulted in his regeneration to his next incarnation. (TV: Logopolis)