Certification
- Australia:MA15+ (TV rating, Season 1-3 DVD)
- Brazil:14
- Canada:14+ (TV rating)
- Ireland:15
- Italy:VM18
- New Zealand:R16 (TV rating, Season 1-3 DVD)
- United Kingdom:15
- United States:TV-14
- United States:TV-14 (DLSV)
- United States:TV-MA (original rating)
- United States:TV-MA (some episodes)
- United States:TV-MA (tv rating)