Codename: Kids Next Door

Five 10-year-olds join forces against adulthood.
Operation: P.I.A.N.O; Operation: Z.O.O.
S1 E11

In 'Operation P.I.A.N.O.', a hamster is sent to replace Number Four for disobeying orders and smashing a piano; in 'Operation Z.O.O.', the Kids Next Door are captured by a children's zoo to be their kid exhibit.

Operation: Q.U.I.E.T; Operation: R.A.I.N.B.O.W.S.
S1 E12

The Kids Next Door try to quietly defend their treehouse from attack while Number One takes a nap; Number Three accidentally takes a mysterious stranger with her to visit Rainbow Monkey Island.