Master's Keller Machine Remote Shutdown Box

The Master’s Keller Machine Remote Control Box is the device that ultimately shuts down the Keller Machine, following the Doctor’s earlier instructions. Off-screen, the Master slides its front mechanism, cutting off the machine’s psychic hold. This object is the linchpin of the Doctor’s gambit—without the Master’s compliance, the sabotage would fail. Its simple slider mechanism belies its critical role in the event, as it directly enables the Doctor’s plan while the Master remains oblivious to his deception.

The Master’s Keller Machine remote control box is a compact but powerful device that allows him to shut down the machine from a distance. By sliding its front mechanism, he severs the Keller Machine’s psychic hold on the Daleks and the Doctor, demonstrating his ability to dictate the outcome of the confrontation. This object underscores the Master’s technological prowess and his preference for remote, calculated control over direct intervention.