Bagpuss
Strange as it may seem, Oliver Postgate and Peter Firmin made only 13 episodes of Bagpuss, but they've captured the imaginations of children for over a quarter of a century.
Bagpuss is a cat who spends his time slumbering in a shop. The shop itself doesn't sell anything and each week his owner, Emily, brings him objects to mend and repair.
Bagpuss will wake up and examine them, in the company of his friends - including Madeleine the rag doll, and the mice from the Marvellous Mechanical Mouse Organ. He then becomes very, very tired and they all go back to sleep. That's basically all that ever happened.