An infuriated Mr. Krupp puts George and Harold in permanent detention for the rest of the school year, in which they are assigned writing a sentence for two hours after school until the chalkboards are completely full, additionally threatening them with suspension if either of them leaves the classroom for any reason. With each boy using a quick line-writing device, they write all their sentences in three-and-a-half minutes, then they pass the time by making a new Captain Underpants comic: "Captain Underpants and the Attack of the Talking Toilets". They decide to go to the copy machine, but realizing that Mr. Krupp will suspend them if they leave the room, they decide to sneak out without Mr. Krupp catching them. However, the copy machine is surrounded by most of the teachers so they go to the gym and try to use Melvin's machine as they still believe it is a normal copy machine.
