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Captain Underpants and the Big Bad Battle of the Bionic Booger Boy Part 2 TRotRRB Part 2 (Book 7)

The Robo Boogers are a trio of monsters created from snot and technology. The beast's names are Trixie, Carl and Frankenbooger. They appear at the end of the 6th book and in the 7th book, they play a much larger role. They first appear pursuing the protagonists through town and when they are about to kill the heroes, Sulu spits them into space. They land on the back of a space shuttle investigating the surface of the planet Uranus and when the astronauts return to Earth, they attack the space station. Eventually, the monsters meet their end when they are destroyed by the vitamin C in oranges.