hard candies, which they end up eating. Meanwhile, the store owners discuss their plan. Having made the grandparents slaves, they will feed them the hard candy, giving them superpowers, and allowing the owners to take over the world. When they walk into the slave room, George and Harold's grandparents had eaten all the candy, causing them to become Boxer Boy and Great Granny Girdle, who chase the bad guys into the UFO. They then order all the Robo-Geezers to attack, who quickly outnumber Boxer Boy and Great Granny Girdle. While Great Granny Girdle has the Robo-Geezers chase her, Boxer Boy attacks the UFO and makes it look like hard candy, causing the Robo-Geezers to start eating the UFO in a feeding frenzy, until one bites the fuel line, and blows up all the bad guys. The boys' Grandparents fly back and set the kidnapped grandparents free. Main characters George Beard - A 4th-grade student of the rude and cruel Jerome Horwitz Elementary School and Harold's next-door neighbor. Harold Hutchins - A 4th-grade student of the rude and cruel Jerome Horwitz Elementary School and George's friend. Evil George Beard - An alternate version of George Beard but wears Harold's clothes. Evil Harold Hutchins - An alternate version of Harold Hutchins but wears George's clothes. Mr. Krupp - The dreadful principal of Jerome Horwitz Elementary School. Captain Underpants - The alter ego of Mr. Krupp. Nice Mr. Krupp - The nice, caring principal of the alternate Jerome Horwitz Elementary School. Captain Blunderpants - The rude and dreadful supervillain counterpart of Nice Mr. Krupp. Boxer Boy - Harold's grandfather, who is one of the two Arthritic Avengers. Here, his name is Henry. Great Granny Girdle - George's great grandmother, who is one of the two Arthritic Avengers. Sulu - George and Harold's pet hamster. Crackers - A pterodactyl from prehistoric times also George and Harold's pet. Supporting characters Melvin Sneedly - George and Harold's nemesis, who is dumb in the alternate universe. Miss Anthrope - The secretary of Jerome Horwitz Elementary School. Mr. Meaner - The gym teacher of Jerome Horwitz Elementary School, who is buff in the alternate universe. Mr. Rected - The guidance counsellor of Jerome Horwitz Elementary School. Ms. Guided - The staff member of Jerome Horwitz Elementary School. Miss Singerbrains - The school librarian of Jerome Horwitz Elementary School. Mr. and Mrs. Beard - George's parents. Mrs. Hutchins -