The Perplexahedron Guards first appeared in the episode Perplexahedron. In this episode they are battled various times by Ben, Gwen and Kevin but confirmed to only show up once getting closer to the Map of Infinity piece and are meant to eliminate anyone who gets close to it. They seem to be completely mute.
Powers and Abilities
The Perplexahedron Guards are robots meant to protect the final piece of the Map of Infinity. When getting closer to the Map of Infinity they shape-shift from a door into a body and begin to fight the encounter. They are shown to have a few abilities such as enhanced strength and shooting laser beams out of their hands.
The Perplexahedron Guards appear to be large white humanoid robots with no facial features except for two dents that are in the shape of eyes (no nose, mouth, etc.). They have a white body. They resemble the body of a large male and appear to be quite well built.