Certification
- Argentina:12 (Star+ rating)
- Australia:M
- Australia:PG (seasons 6, 8-10)
- Brazil:12
- Canada:14+
- Canada:G (Ontario/Quebec, DVD rating)
- Finland:K-7
- Finland:K-12 (one episode)
- Finland:S (some episodes)
- France:10
- Germany:12 (TV rating)
- India:U
- Indonesia:17+ (self-applied)
- Italy:T
- Mexico:S/C (self-applied)
- Netherlands:AL
- Netherlands:6 (seasons 5 and 6)
- New Zealand:M
- Norway:9 (TV rating)
- Poland:7
- Russia:16+
- Singapore:NC16
- South Africa:12+ (self-applied)
- Spain:A
- United States:TV-PG
- United States:TV-14 (original rating)
- United States:TV-14 (some episodes)