Which are the safest cartoon series for 4-6 yr olds? i was horrified by violence and foul language shown in some.

For me, I like to offer my kids to watch educational DVDs e.g. The Cat In The Hat Knows A lot About That (science), Animal planets, Sids the Science Kids and etc. For chinese language I will suggest 巧虎 (Qiao Hu) and Ten Thousands of Why (十万个为什么)。