Certification
- Argentina:Atp
- Australia:PG
- Australia:M (some episodes)
- Brazil:12
- Canada:14A (Manitoba/Nova Scotia, DVD rating)
- Canada:G (Quebec)
- Finland:K-3 (2003, DVD)
- France:Tous publics (DVD rating)
- Germany:12
- Ireland:12
- Italy:VM14 (self-applied)
- Mexico:13 (self-applied)
- Netherlands:6 (DVD rating)
- New Zealand:PG
- New Zealand:M (season 3)
- Norway:A (recommended rating)
- Poland:15 (DVD rating)
- Singapore:PG
- Singapore:NC-16 (season 5)
- Spain:TP (DVD rating)
- Sweden:7 (self-applied)
- Turkey:13+ (self-applied)
- United Kingdom:12
- United States:TV-PG
- United States:TV-14 (GetTV)
- United States:TV-MA (iTunes rating)