Detention is the thirty-ninth episode in Season 1 of Clarence.
When detention becomes the place to be during recess, Jeff transforms it into a 'too-cool-for-school' club.
Miss Baker gives a geography class, Clarence plays too much with his card to such an extent that Miss Baker sends him to punishment. There, Clarence and Percy find many toys to have fun. The next day Clarence they invite some more children and they discover a "secret cabinet" with more toys, the children keep having fun. Jeff arrives at the punishment room and threatens to tell an adult about what they're doing, Malessica convinces him not to do it and Jeff is included in the children's fun. The next day, Jeff organizes a party in the punishment room, all are disguised and happy, with the exception of Clarence, he fulfills Jeff's favor of organizing an order for toys, but takes too long to take a toy and everyone break the order. Clarence suggests going outside, but nobody wants and he goes alone. Jeff shows everyone his "surprise" that is a statue of himself made in blocks, but nobody likes it, then seeing Clarence, children go out to play in the yard, Jeff gets nervous and begins to move the letter of Black humor, it catches fire and makes water fall in the punishment room. Mr. Reese wakes up and removes Jeff's hall monitor band, ending the episode.