Certification
- Australia:MA15+
- Brazil:14
- Canada:13+ (Quebec)
- France:10
- Germany:16
- Ireland:15
- Italy:T (DVD rating)
- Japan:R (self-applied)
- Netherlands:12
- New Zealand:R13
- New Zealand:M (season 6)
- Norway:15 (DVD rating)
- Philippines:PG-13
- Poland:16
- South Korea:15
- Spain:12
- Turkey:7+ (TV rating)
- United Kingdom:15
- United States:TV-14
- United States:TV-PG (some episodes)