Certification
- Argentina:16
- Australia:MA15+ (Season 1 - 4)
- Australia:M (some episodes)
- Brazil:14
- Canada:13+ (Quebec)
- Egypt:Not Rated
- Finland:K-13 (2008, Season 1 DVD rating)
- France:Tous publics (DVD ratings)
- Germany:16 (internet)
- Hungary:16 (some episodes)
- India:16
- Indonesia:16+ (self-applied)
- Italy:T
- Malaysia:U (season 1, season 2)
- Malaysia:P13 (season 3, season 4)
- Mexico:C (DVD rating)
- Netherlands:12 (seasons 1 and 2)
- Netherlands:16 (seasons 3-4)
- New Zealand:R13 (Season 1 DVD rating)
- Norway:15 (TV rating)
- Philippines:16+ (self-applied)
- Poland:15 (DVD rating)
- Singapore:NC-16 (season 1 - 4)
- South Korea:15
- Spain:16
- Sweden:16+ (self-applied)
- Turkey:16+ (self-applied)
- United Kingdom:15
- United Kingdom:12 (some episodes)
- United States:TV-14
- United Arab Emirates:16+ (self-applied)