Certification
- Australia:PG (some episodes)
- Australia:M (some episodes)
- Canada:PG (Manitoba, season 1, DVD rating)
- Canada:14A (Manitoba, seasons 2-6, DVD rating)
- Germany:6
- Ireland:12
- Netherlands:AL
- Netherlands:6 (season 5)
- New Zealand:M (season 3)
- New Zealand:PG (seasons 1, 2, and 4)
- Singapore:PG13
- United Kingdom:12
- United States:TV-PG