Captain Underpants: In The Return Of Mexico

Plot
From where Captain Underpants: The Ultimate Continuation left off, Captain Underpants, George, Harold, and Melvin Sneedly were running away from zombies in Piqua. Captain Underpants kills them all, but seconds later, a car punched him into a bank of a river, causing him to fall into the river and well, turned back into Mr. Krupp.

Mr. Krupp was angry at George and Harold for killing Riles Rected. Even they were innocent, Mr. Krupp put them into juvenile detention. While George and Harold were in jail, Mr. Krupp told it to their parents. George saw a hidden key in a chestbox and he used it to unlock the door and free Harold. Without further notice, George used the key to lock all the prisoners, causing a lot of prisoners to come out of their jail cell and start a riot. While trying to escape, their escape route was seriously blocked by a guard who tried to drag them back to where they had been in. George was smart; so he kicked the door next to the guard and the door hit him in the groin and hips and fell backwards.

A note was in the pocket of the guard. Harold picked it up and read the note: "If you see this note you would be traveled back to 2018". The boys then were soon travelled back into 2018 back when the boys were about to be fourth-graders.