The Incredible Robo-Plunger

The Incredible Robo-Plunger is a character that first appears in Captain Underpants and the Attack of the Talking Toilets.

Captain Underpants and the Attack of the Talking Toilets
George and Harold created The Incredible Robo-Plunger by 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 and Harold's problems weren't over yet. They reached into the crumpled mouth of The TT 2000 and 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 Turbo Toilet 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.

Captain Underpants and the Perilous Plot of Professor Poopypants
The Robo-Plunger was briefly seen on the front page of a newspaper that Professor Poopypants was reading.

Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy - Part 2: The Revenge of the Ridiculous Robo-Boogers
The Incredible Robo-Plunger appears in space as shown on the screen monitor of the Poopsie shuttle.

Captain Underpants and the Tyrannical Retaliation of the Turbo Toilet 2000
The Robo Plunger met his end in this book, because the kickball that The Harold 2000 kicked into outer space decapitated the Robo-Plunger. His PATSY juice revived the Turbo Toilet 2000.