Certification
- Australia:MA15+
- Australia:MA15+ (some episodes)
- Australia:M (some episodes)
- Brazil:12
- Canada:14A (Manitoba, video rating)
- Canada:14A (Manitoba, volume 1 & 2)
- Canada:PG (Manitoba, volume 3)
- Canada:18A (Manitoba, volume 4)
- Canada:16+ (Quebec)
- Canada:16+ (Quebec, VHS/DVD rating)
- Chile:14
- Germany:16
- Japan:R-15
- Malaysia:18
- Netherlands:12
- New Zealand:M
- New Zealand:Objectionable
- New Zealand:R16 (DVD volume 2)
- South Korea:18
- South Korea:19 (cable rating)
- United Kingdom:15
- United Kingdom:18
- United Kingdom:15 (some episodes)
- United Kingdom:18 (some episodes)
- United Kingdom:18 (volume 2)
- United States:TV-MA