Wild Cat Jack's Lullaby - S1.E78

When Mrs. Spoon grew small, Black Jack, the stray cat, arrived. He has found a treasure, and he wants his aunt to see it. Her aunt is carried away on B.J.'s girlfriend's back. Along the way, she encounters a lot of trouble, including falling into a river and meeting a naughty trio. The ladies finally arrived at their destination. What treasure did you see there?