Land of the Lost(1974 - 1977)
This show was about a father and his son and daughter who get sucked into a rift in the earth. Their jeep lands in "The Land of the Lost", a pre-historic time period, and they need to learn how to survive so they can find a way back home. They meet some dangerous creatures along the way, but they also makes friends and allies as well. The show was a bit campy, but I found it to be enjoyable :)
The German intro to the 1991 series, called "Im Land der Dinosaurier."