B.O.S.S.: Best Old Shows (that) Stopped

Help me remember the name of these shows..

1.It had a squirrel and this boy. It aired around 2005, and the squirrel always got the boy in trouble.

2. This show had the characters in like caveman times, and there was one character from the future...It had like, schoolhouse rock graphics?

3. This show also had older graphics, but it was set in the jungle. I also remember one of the characters was a girl with an Australian accent.