Prototype was the common designation for a first working model of a new invention.

K1 was an experimental prototype. (TV: Robot)

Davros unveiled the prototype Mark III Travel Machine before the Kaled Scientific Elite. The Fourth Doctor witnessed this on his mission from the Time Lords to interfere with the creation of the Daleks. (TV: Genesis of the Daleks)

Kartz and Reimer developed a prototype time module based on Time Lord designs. (TV: The Two Doctors)

The Master duplicated a stolen Time Ring prototype in a plan to send his agents to assassinate key figures in Earth's history, but was thwarted by James Stevens, who used one of the Time Rings to prevent Lee Harvey Oswald's death, and later to assassinate John F. Kennedy. (PROSE: Who Killed Kennedy)

John Lumic had his Cybermen designs prototyped. The prototype killed Kendrick after he refused to cooperate with the project. (TV: Rise of the Cybermen)

During the Dalek Invasion of Earth, General Sanchez gave Martha Jones the prototype for Project Indigo, teleport technology salavaged from the Sontarans in the Sontaran invasion of Earth, so she could travel to the Osterhagen Station in Germany. (TV: The Stolen Earth)

Lomax had a prototype supersoldier created, under the name "Project Trojan". (TV: The Eclipse of the Korven)

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