Mark I Travel Machine

The Mark I was the name given by Davros to a Travel Machine prototype, the casing of the first Dalek that he created. It was an experimental life support unit modeled after his own chair. Besides the transplanted Thal brain, it included a life support matrix, an optical stalk, feeding tubes and was activated by a power conduit with only 92% distribution. (AUDIO: Guilt)

The Daleks were later perfected by Davros in the Mark III Travel Machine. (TV: Genesis of the Daleks)

Davros' claims to have designed the Daleks' travel machines were later contradicted by the Daleks themselves under the command of the Dalek Prime, who instead claimed that he had stolen the designs from other scientists and then passed them off as his own. (PROSE: War of the Daleks) Indeed, in one account, the very first Dalek casings were originally the "Dalek War Machines" designed by the scientist Yarvelling for use in the war against the Thals before the mutated Daleks claimed them as protection against the harsh conditions of the devastated, irradiated Skaro. (COMIC: Genesis of Evil)

History
The first Mark I Travel Machine created by Davros hosted the brain of Baran, a captured Thal spy. (AUDIO: Guilt)

Behind the scenes

 * "Mk I Dalek" is the fan name given to the first model of Dalek casings, as seen in TV: The Daleks and COMIC: Genesis of Evil, some of whom were also seen on the restored Skaro attending to the dying Davros in TV: The Magician's Apprentice. They are distinguishable by their lack of slats. In this terminology, the "Mk II" isthe one with a dish from The Dalek Invasion of Earth with the "Mk III" — tying back to the designation of the standard Dalek casing from Genesis of the Daleks — being for the one with slats first seen in The Chase. Within in-universe sources, however, there is little in-universe room for Davros's Mark I Travel Machine to correspond to the Daleks in The Daleks, as the clear intent behind Genesis of the Daleks was that it took place prior to The Daleks. The term of Dalek War Machine is instead given by Genesis of Evil as the original name of the casings seen in the first few Dalek television stories.