Certification
- Australia:M (some episodes)
- Australia:MA15+ (some episodes)
- Canada:13+ (Quebec)
- Finland:K-12 (DVD rating)
- France:10
- Germany:12
- India:A (recommended rating)
- Ireland:15 (series 1)
- Ireland:18 (series 3)
- Netherlands:12 (seasons 1-3)
- Philippines:SPG
- United Kingdom:15
- United States:TV-MA