Codename: Kids Next Door - Season 3 - Eps 7: Operation: B.U.T.T.
Feeling that Numbuh 1 must take a day off, the team force him to go to the beach, telling him to have fun or else. Nigel makes an honest attempt - until a crab swipes his swim trunks! After suffering a great amount of public embarrassment, 1 makes his way back to the Treehouse... and minutes later, walks out of his room to tell his terrified team that he's resigning from the Kids Next Door! After he leaves, the purpose becomes quite clear... an envelope is found in his room from the Delightful Children, with a picture of his tush and a note saying ""Leave your team behind or we'll put your behind in the school yearbook."" Now Numbuh 1 is heading for Delightful Manor, where the evil peeping toms desire to make him one of them! Can the team save their leader from the sadistic shutterbugs?!
About Codename: Kids Next Door

Title: Codename: Kids Next Door
First Air Date: 2002-12-06
Last Air Date: 2007-11-23
Status: Ended
Rating: 8.2/10 (from 731 votes)
Language: EN
Seasons: 7
Total Episodes: 139
Network: Cartoon Network
Genres: Animation, Action & Adventure, Comedy, Sci-Fi & Fantasy, Kids, Family
Production Companies: Curious Pictures, Cartoon Network Studios
Synopsis
Taking numbers instead of names, five extraordinary 10-year-olds form a covert team called the Kids Next Door with one dedicated mission: to free all children from the tyrannical rule of adults.
Cast

Ben Diskin
Numbuh 1 / Numbuh 2 (voice)

Lauren Tom
Numbuh 3 (voice)

Dee Bradley Baker
Numbuh 4 (voice)

Cree Summer
Numbuh 5 (voice)