We first encounter the RPD in Series 6. Having established a good relationship with Doctor Light, the Mechanical Maniacs are welcomed as formal police officers within the force. At first the identity of the Chief of (robot) Police is kept a strict secret, but eventually he is revealed to the Mechs and later to the world at large as the former villain Crorq. Crorq had been captured by the RPD and was forced to organize them using his highly efficient operating systems. Crorq initially resented his forced position in the RPD, but later grew to relish the power it granted him during the War.