Certification
- Australia:M
- Brazil:12
- Canada:PG (Manitoba/Nova Scotia/Ontario, DVD rating)
- Canada:14A (Ontario, season 5, DVD rating)
- Canada:PG (TV rating)
- Canada:14+ (some episodes)
- Germany:0 (most episodes)
- Germany:6 (one episode)
- Germany:12 (two episodes)
- Greece:K-8
- India:13
- Netherlands:6
- Singapore:NC-16 (season 1, season 2)
- Spain:12
- United Kingdom:15
- United States:TV-14
- United States:TV-PG (TV Rating)
- United States:TV-14 (original rating)
- United States:TV-14 (re-rating)