Name – Davros
Species – Human
Planet – Earth
Temperament – Megalomaniac
Appearances – Genesis of the Daleks, Destiny of the Daleks, Resurrection of The Daleks, Revelation of the Daleks, Remembrance of The Daleks, The Stolen Earth, Journey’s End

When the Doctor first met Davros in Genesis of the Daleks, he was the chief scientist of the Kaleds, heading the Elite Scientific Division. Davros realised that contamination from the nuclear and biological weapons used in the war was mutating the Kaled race, and artificially accelerated the process to examine the ultimate evolutionary end product. The mutations were weak and crippled: no more than brains with tentacular appendages and with no hope of survival on their own. His solution was to remove all emotions pertaining to weakness, such as compassion, mercy and kindness, and place the mutants in tank-like "Mark III travel machines" partly based on the design of his own wheelchair. He later named these creatures Daleks, an anagram of Kaleds.

Davros quickly became obsessed with his creations, considering them to be the ultimate form of life, superior to all others. To stop his own people from shutting down his Dalek project, he arranged for them to be wiped out by the Thals. The Daleks then almost exterminated the Thal victors, but ultimately turned on Davros and apparently killed him.

But Davros was not dead. Some years later, in the events of Destiny of the Daleks, The Daleks had unearthed their creator — who had apparently been in suspended animation since his "death" — to help them break a logical impasse in their war against the android Movellans. However, the Dalek force was destroyed by the Doctor, and Davros was captured and imprisoned in a cryogenic cell by the humans that the Daleks had been using as slave labour.

In Resurrection of the Daleks, a small Dalek force aided by human mercenaries and Dalek duplicates liberated Davros from his space station prison because they needed his expertise to find an antidote for a Movellan-created virus that had all but wiped them out. Believing his creations to be treacherous, Davros began using mind control on Daleks and Humans, ultimately releasing the virus to kill off the Daleks before they could exterminate him. However, he apparently succumbed to the virus himself before he could escape, his physiology being close enough to that of the Daleks for the virus to affect him.

Davros was next seen as "The Great Healer" of the funeral and cryogenic preservation centre Tranquil Repose on the planet Necros in Revelation of the Daleks, where he used frozen bodies to engineer a new variety of Daleks loyal to him, distinguished from the original Daleks by their white and gold livery and slightly changed design. For a while there appeared to be two Davroses: one was a head in a tank, a decoy for assassins; the other was in his usual chair which was now able to hover. He emerged from hiding when the decoy was assassinated, able to move his neck and fire electric bolts from his hand – although the hand was shot off shortly before the original Daleks arrived to defeat his new Daleks and transport Davros to face trial on Skaro.

Davros was the Emperor Dalek in Remembrance of the Daleks, with his white and gold Daleks now based on Skaro and termed "Imperial Daleks", fighting against the grey "Renegade Dalek" faction. By this time, Davros was physically transplanted into a customised Dalek casing. Both Skaro and the Imperial Dalek mothership were apparently destroyed when the Doctor tricked Davros into using the Time Lord artifact known as the Hand of Omega. However, a Dalek on the bridge of Davros' ship reported that the Emperor's escape pod was being launched and a white light was seen speeding away from the ship moments before its destruction.

In The Stolen Earth, The Doctor learnt that Davros was alive, after seeing him apparently killed during the first year of the Time War. Dalek Caan had used an emergency temporal shift to go to the events of the Time War, a feat thought impossible due to the events being 'time-locked'. He saved Davros, at cost of his own sanity. Davros used cells from his own body to breed a new Dalek race, enough so that he had little skin and flesh left on his chest and his ribcage and internal organs were visible under his leather jerkin. Under his guidance, the Daleks 'stole' 27 planets, including Earth, and hid them in the Medusa Cascade, one second out of sync with the rest of the universe.

Davros had a cybernetic hand, replacing the one that was destroyed previously. He could still fire energy bolts through it.

In Journey's End, however, the Doctor realised that Davros was not in control of the Daleks but was being kept prisoner in the Vault, having been overthrown and kept for his scientific knowledge. With Davros' knowledge, the Daleks had created a "reality bomb" that would use the stolen planets as a beacon to cause all matter to dissolve into its atoms, wiping out all of existence except for the Daleks in the Crucible. Davros declared this to be his "ultimate victory". It turned out, however, that he and the Daleks were being misled and betrayed by Dalek Caan who was using his prophecies and influence to bring the Doctor and Donna to meet, causing the destruction of the Daleks. Davros was apparently killed when the Crucible was destroyed. The Doctor offered to take Davros to safety, but Davros refused, accusing the Doctor of being responsible for the destruction and calling him the "destroyer of worlds".

Death: Who knows? Somehow he seems to keep coming back.