Robot Summerfield

A robot duplicate of Captain Summerfield was sent back in time to Summerfield and Alistair Gordon Lethbridge-Stewart's first day at HQ by the scientist Deller in an effort to avert his original defeat at the hands of the Brigadier.

The robot Summerfield killed the real Summerfield and attempted to detonate a bomb, but was killed by the Brigadier before he could do so; after bullets proved to have little effect, save to reveal the mechanical being underneath the false skin, the Brigadier managed to kill the robot by dumping a pot full of tea on him, short-circuiting him. (AUDIO: Memories of Tomorrow)