Die Sendung mit der Maus (The Program with the Mouse) is a very popular German children's show that airs on Sunday mornings. Adults love it too, including yours truly. In fact, it's must see viewing at my house.
Each shows consists of several segments, including educational features, and of course, short cartoons featuring the mouse and his friends. The show first aired in 1971 and has become a German cultural institution. If you want to understand German culture then watch die Maus.