Grey robots

Xerxes, Yves and Zero are the three grey neutral robots working at Death Trap Incorporated. Unlike the five main robots, Alice, Bob, Clark, Dennis and Ernest, it is not necessary or even possible to lead them to the goals of the levels. All three can be encountered in several areas, where they either mind their own business or are part of the level's challenge, for example by walking over switches. Unlike the five main robots, the grey ones also can appear several times in a single level.

Xerxes
Xerxes has a simple cylindrical body made of grey metal and two feet, and unlike the other two grey robots actually has arms. On the other hand, he lacks any sort of head.

Yves
Yves has the same cylindrical grey body the other two have, but lacks arms. Instead of a head, this model has a lightbulb.

Zero
Zero shares the same body as the other two, and like Yves, lacks arms. His head is a simple cuboid with two small, glowing eyes.

Trivia

 * All Yves, Xerxes and Zero can be seen wearing chef's hats at Death Trap Inc's Acid Processing department, implying they has been entrusted with the brewing process.
 * On the factory grounds, one can see them near the path leading towards the credits. They also can be seen sitting next to each other in the credits themselves.
 * For several levels, it is mandatory to destroy them in order to progress.
 * One, possibly disfunctional, copy of Xerxes can be found in the player's office, where it serves as a table for some of their rewards.