Codename: Kids Next Door

Codename: Kids Next Door (or "KND") is a cartoon show about five kids who go on secret missions to fight grown-up villains who try to make life harder for kids. The five kids each live in secret tree houses in their backyards. They all have special gadgets and weapons to help them in their missions. The bad guys are called "Adults," and the kids use their wit and imagination to outsmart them.