Teselecta antibody

The Tessalecta Antibodies were robotic guards inside Tessalecta robots. The antibodies took the role of security, killing anybody who did not have the correct privilege to be in their sector of a Tessalecta. A Nazi general was one such victim of the Tessalecta Antibodies.

Appearance
They were about four feet tall, with bulbous heads. Cables, resembling tentacles, protruded from this head, giving the appearance of a cephalopod. (DW: Let's Kill Hitler)

Technology
They had anti-gravity technology and hovered through the air. They used a laser to kill their targets, and could also manipulate their wires to hold people in place.

The antibodies could only recognise if a person had the correct privileges by noting if they had a bracelet that glowed green. Without that device, they would politely incinerate the intruder.

They emerged from consoles in the Tessalecta's main robot. There were at least a dozen of them. They also had access to scanner technology, as they could tell that there were only two humans on board the Tessalecta after the crew had beamed off. (DW: Let's Kill Hitler)