Certification
- Australia:MA15+
- Canada:14+
- Canada:14A (Manitoba, DVD rating)
- Canada:18A (Ontario, DVD rating, seasons 3-5)
- Germany:16 (internet)
- Netherlands:12
- Netherlands:6 (season 1)
- New Zealand:R16
- United States:TV-14
- United States:TV-MA (some episodes)
- United Arab Emirates:Not Rated (self-applied)