Polybius

Polybius is an arcade machine from an urban legend, first appearing in the YouTube video Existenz ist Falsch.

In this video, Yabba Dabba Delete This Fred appears for most of the video, glitching about and making the video seem like the viewers are hallucinating, then, Polybius appears near the end of it in black and white, to show that he is the mastermind behind this scheme. Polybius has yet to make any major appearances other than the end of this video.

Polybius, much like his urban legend counterpart, appears to be capable of psychoactive effects, as he controls Yabba Dabba Delete This Fred's body distorting and changing colors to make the viewer hallucinate. Polybius has no confirmed voice as of right now, as he has only appeared in the end of one video.