“The Incredible Robo-Plunger,” is a character that first appeared in Captain Underpants & the Attack of the Talking Toilets.
George & Harold created The Incredible Robo-Plunger, using the “PATSY” 2000, also known as the “Photo-Atomic-Trans-Somgomulating Yectofantriplutoniczanziptomiser,” as it was the only thing they could use to defeat the Turbo Toilet 2000. The Incredible Robo-Plunger then defeated the evil Turbo Toilet 2000, but George & Harold's problems weren't over yet. They reached into the crumpled mouth of The TT 2000 & pulled out their principal. They then gave him back his clothes and toupee. As he dresses himself, Mr. Krupp believes that he will get fired, but George and Harold assure him that they can fix everything under certain circumstances. Mr. Krupp complies with this, but only if they can do that. George and Harold then tell the Incredible Robo-Plunger to fix the school up. Once he does so, he takes the Talking Toilets and the TT 2000 to Uranus and is ordered to not come back to Earth. After that, the Incredible Robo-Plunger makes minor cameos in the next few books.
The Robo-Plunger was briefly seen on the front page of a newspaper that Professor Poopypants was reading.
The Incredible Robo Plunger appears in space as shown on the screen monitor of the Poopsie shuttle.