Codename: Kids Next Door - Season 1 - Eps 23: Operation: Z.O.O.
Sector V is put into a "kids zoo" and must unite with the Delightful Children From Down The Lane and get all the other children out of their cages before lunch time to escape being fed to the zoo's cannibal bully.
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)