Zyzzybalubah is a malevolent but lonely male alien (similar in personality and mannerisms to Zim from Nickelodeon's Invader ZIM, which was created years later), from Pee-Wee's Playhouse, who hypnotized Conky into making his own name the secret word and launched the Playhouse into space. He calls anyone he captures his "friends" (such as Yvona) but Pee-wee (upon arrival and capture on Zyzzy's homeworld) furiously sets him straight with the following explanation:
"YOU'VE GOT THE WRONG IDEA! Friends are people that you care about and who care about you! YOU BROUGHT US HERE WITHOUT EVEN ASKING US IF WE WANTED TO COME! And you haven't exactly been treating us the way friends should be treated!"
After realizing his mistake, Zyzzy turns off the force field holding the captives (he had turned it on in an attempt to recapture Yvona). Earlier, Zyzzy claimed that he was watching Pee-wee for some time, noting how much fun the man-child has in the place. Zyzzy also claimed that it was an honor and very flattering to have the secret word be his name before this statement, though we could see that he was the one that made Conky do such a thing. It is implied by Yvona that Zyzzy has kept her locked in a cage and forced into servitude by him for a very long time. It is implied that he is the ruler of the planet that he forces Pee-wee and the others to visit, as Yvona states that everyone on her planet has been enslaved by Zyzzy and forced into obedience. In one scene, two ant warriors are at his flank, but they just float uselessly and do not respond to what their master is saying.
His home base is a mysterious crystalline structure of unknown construction, though it only appears in two scenes.
He was played by George McGrath.
Zyzzy acts like a typical deranged and overconfident alien ruler found in sci-fi cartoons and TV shows. Initially, he is very authoritative, domineering, and forceful, demonstrated by silencing Pee-wee after he makes a joke about Zyzzy contacting him on the Picturephone ("Good connection! You sound next-door!"), and by forcing Yvona into servitude and locking her in a cage. After being told the truth of what friendship really is, he backs down and changes for the better, learning that one must be nice to have lasting friendships.
- Played by George McGrath, he is the second character to be performed by this actor. He resembles the character Megamind, and is the only villainous extraterrestrial life-form that Pee-wee encountered in the series.