Juggernaut

The Juggernauts were cyborgs created by Davros under the guise that they were to be the "ultimate service robots".

Based on the planet Lethe, and with the help of fellow scientists, including Melanie Bush, Davros attempted to create another race of cyborgs, having escaped from his Daleks who considered him an eneimy.

The Juggernauts were created by installing the DNA of Humans into the mechanical shells of Mechanoids, robots whose original purpose was to serve Humans and prepare planets for Human colinization.

During this time, the Daleks, threatening Mel's life, order the Doctor to spy on Lethe and he discovers the Juggernauts.